----

----

| Pennsylvania                             |   | 23-1683282          |
|------------------------------------------|--------|---------------------|
| (State or other jurisdiction of          |   | (I.R.S. Employer    |
| incorporation or organization)           |   | Identification No.) |
|                                     |   |                |
| 160 Cassell Road, P.O. Box 144           |   |                |
|   Harleysville, Pennsylvania   |   | 19438               |
| (Address of principal executive offices) |   | (Zip Code)          |

----

----

----

MET-PRO CORPORATION

| PART I – FINANCIAL INFORMATION |                                                    |
|--------------------------------------|---------------------------------------------------------|
|                                 |                                                    |   |   |
|   Item 1.                       |                                                    | Financial Statements |   |
|                                 |                                                    |   |    |
|                                 | Consolidated Balance Sheets                             |   |
|                                 |                                                    | as of April 30, 2011 and January 31, 2011 | 2 |
|                                 | Consolidated Statements of Income                       |   |
|                                 |                                                    | for the three-month periods ended April 30, 2011 and 2010 | 3 |
|                                 | Consolidated Statements of Shareholders’ Equity   |   |
|                                 |                                                    | for the three-month periods ended April 30, 2011 and 2010 | 4 |
|                                 | Consolidated Statements of Cash Flows                   |   |
|                                 |                                                    | for the three-month periods ended April 30, 2011 and 2010 | 5 |
|                                 | Notes to Consolidated Financial Statements              | 6 |
|                                 | Report of Independent Registered Public Accounting Firm | 19 |
|                                 |                                                    |   |   |
|   Item 2.                       |                                                    | Management’s Discussion and Analysis of Financial Condition and Results of Operations | 20 |
|                                 |                                                    |   |   |
|   Item 3.                  |                                                    | Qualitative and Quantitative Disclosures about Market Risk | 27 |
|                                 |                                                    |   |   |
|   Item 4.                       |                                                    | Controls and Procedures | 27 |
|                                 |                                                    |   |   |
|                                 |                                                    |   |   |
| PART II – OTHER INFORMATION    |                                                    |
|                                 |                                                    |   |   |
|   Item 1.                  |                                                    | Legal Proceedings | 28 |
|                                 |                                                    |   |   |
|   Item 1A.                 |                                                    | Risk Factors | 29 |
|                                 |                                                    |   |   |
|   Item 2.                  |                                                    | Unregistered Sales of Equity Securities and Use of Proceeds | 29 |
|                                 |                                                    |   |   |
|   Item 3.                       |                                                    | Defaults Upon Senior Securities | 29 |
|                                 |                                                    |   |   |
|   Item 4.                  |                                                    | Submission of Matters to a Vote of Security Holders | 29 |
|                                 |                                                    |   |   |
|   Item 5.                  |                                                    | Other Information | 29 |
|                                 |                                                    |   |   |
|   Item 6.                       |                                                    | Exhibits | 30 |
|                                 |                                                    |   |   |
|                                 |                                                    |   |   |
| SIGNATURES                           | 31                                                      |

----

Index

MET-PRO CORPORATION

| PART I – FINANCIAL INFORMATION                                                                                                 |         |   |         |   |
|--------------------------------------------------------------------------------------------------------------------------------------|--------------|--------|--------------|--------|
|                                                                                                                                 |         |   |         |   |
| Item 1.  Financial Statements                                                                                              |         |   |         |   |
|                                                                                                                                 |         |   |         |   |
|                                                                                                                                 | April 30,    |   | January 31,  |   |
| ASSETS                                                                                                                               | 2011         |   | 2011         |   |
| Current assets                                                                                                                       | (unaudited)  |   |         |   |
|       Cash and cash equivalents                                                                        | $29,366,309  |   | $32,400,814  |   |
|       Short-term investments                                                                           | 497,155      |   | 497,155      |   |
|       Accounts receivable, net of allowance for                                                        |         |   |         |   |
|          doubtful accounts of approximately                                             |         |   |         |   |
|          $463,000 and $444,000, respectively                                            | 17,119,493   |   | 15,311,322   |   |
|       Inventories                                                                                      | 16,045,351   |   | 15,474,430   |   |
|       Prepaid expenses, deposits and other current assets                                              | 1,602,533    |   | 1,578,176    |   |
|       Deferred income taxes                                                                            | 84,698       |   | 84,155       |   |
|                Total current assets                       | 64,715,539   |   | 65,346,052   |   |
|                                                                                                                                 |         |   |         |   |
| Property, plant and equipment, net                                                                                                   | 19,904,798   |   | 19,863,031   |   |
| Goodwill                                                                                                                             | 20,798,913   |   | 20,798,913   |   |
| Other assets                                                                                                                         | 2,056,720    |   | 2,038,332    |   |
|                Total assets                                    | $107,475,970 |   | $108,046,328 |   |
|                                                                                                                                 |         |   |         |   |
| LIABILITIES AND SHAREHOLDERS’ EQUITY                                                                                           |         |   |         |   |
| Current liabilities                                                                                                                  |         |   |         |   |
|       Current portion of debt                                                                          | $949,149     |   | $532,540     |   |
|       Accounts payable                                                                                 | 5,746,014    |   | 4,864,724    |   |
|       Accrued salaries, wages and benefits                                                             | 1,171,483    |   | 1,650,314    |   |
|       Other accrued expenses                                                                           | 2,707,142    |   | 2,286,043    |   |
|       Dividend payable                                                                                 | 967,529      |   | 967,445      |   |
|       Customers’ advances                                                                        | 856,184      |   | 907,107      |   |
|                Total current liabilities                  | 12,397,501   |   | 11,208,173   |   |
|                                                                                                                                 |         |   |         |   |
| Long-term debt                                                                                                                       | 2,934,671    |   | 3,011,988    |   |
| Accrued pension retirement benefits                                                                                                  | 3,776,785    |   | 6,553,262    |   |
| Other non-current liabilities                                                                                                        | 54,744       |   | 54,195       |   |
| Deferred income taxes                                                                                                                | 2,746,780    |   | 2,745,786    |   |
|                Total liabilities                          | 21,910,481   |   | 23,573,404   |   |
|                                                                                                                                 |         |   |         |   |
| Shareholders’ equity                                                                                                           |         |   |         |   |
|       Common shares, $.10 par value; 36,000,000 shares                                                 |         |   |         |   |
|           authorized, 15,928,679 shares issued, of which                           |         |   |         |   |
|           1,269,134 and 1,270,417 shares were reacquired                           |         |   |         |   |
|           and held in treasury at the respective dates                             | 1,592,868    |   | 1,592,868    |   |
|       Additional paid-in capital                                                                       | 3,629,575    |   | 3,448,249    |   |
|       Retained earnings                                                                                | 93,558,225   |   | 93,113,247   |   |
|       Accumulated other comprehensive loss                                                             | (2,734,006   | )      | (3,201,767   | )      |
|       Treasury shares, at cost                                                                         | (10,481,173  | )      | (10,479,673  | )      |
|               Total shareholders’ equity                 | 85,565,489   |   | 84,472,924   |   |
|               Total liabilities and shareholders’ equity | $107,475,970 |   | $108,046,328 |   |
| See accompanying notes to consolidated financial statements.                                                                         |         |   |         |

----

Index

MET-PRO CORPORATION

|                                                | Three Months Ended |
|-----------------------------------------------------|--------------------|
|                                                | April 30,          |
|                                                | 2011               |   | 2010 |   |
|                                                |               |   |   |   |
| Net sales                                           | $23,429,903        |   | $22,277,077 |   |
| Cost of goods sold                                  | 15,371,698         |   | 14,295,538 |   |
| Gross profit                                        | 8,058,205          |   | 7,981,539 |   |
|                                                |               |   |   |   |
| Operating expenses                                  |               |   |   |   |
| Selling                                             | 2,916,126          |   | 2,932,897 |   |
| General and administrative                          | 3,059,103          |   | 2,945,602 |   |
|                                                | 5,975,229          |   | 5,878,499 |   |
| Income from operations                              | 2,082,976          |   | 2,103,040 |   |
|                                                |               |   |   |   |
| Interest expense                                    | (48,801            | ) | (82,510 | ) |
| Other income, net                                   | 105,986            |   | 117,468 |   |
| Income before taxes                                 | 2,140,161          |   | 2,137,998 |   |
|                                                |               |   |   |   |
| Provision for taxes                                 | 727,654            |   | 726,920 |   |
| Net income                                          | $1,412,507         |   | $1,411,078 |   |
| Earnings per share, basic (1)                       | $.10               |   | $.10 |   |
|                                                |               |   |   |   |
| Earnings per share, diluted (2)                     | $.10               |   | $.10 |   |
|                                                |               |   |   |   |
| Cash dividend per share – declared (3)        | $.066              |   | $.06 |   |
|                                                |               |   |   |   |
| Cash dividend per share – paid  (3) | $.066              |   | $.06 |   |

|                                                         | (1)    | Basic earnings per share are based upon the weighted average number of shares outstanding of 14,659,117 and 14,619,000 for the three-month periods ended April 30, 2011 and 2010, respectively.                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                         |   |                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|                                                         | (2)    | Diluted earnings per share are based upon the weighted average number of shares outstanding of 14,841,720 and 14,693,035 for the three-month periods ended April 30, 2011 and 2010, respectively.                                                                                                                                                                                                                                                |
|                                                         |   |                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|                                                         | (3)    | The Board of Directors declared quarterly dividends of $.066 per share payable on March 17, 2011 and June 15, 2011 to shareholders of record at the close of business on March 3, 2011 and June 1, 2011, respectively. The Board of Directors declared quarterly dividends of $.06 per share payable on March 12, 2010 and June 11, 2010 to shareholders of record at the close of business on February 26, 2010 and May 28, 2010, respectively. |
|                                                         |   |                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|                                                         |   |                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|                                                         |   |                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| See accompanying notes to consolidated financial statements. |

----

Index

MET-PRO CORPORATION

|                                                                 |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
|----------------------------------------------------------------------|------------|--------|---------|------------|----------|--------|---------------|--------|----------|-------------|--------|--------|--------------|--------|--------|-------------|--------|
|                                                                 |       |   |    |       |     |   |          |   |     | Accumulated |   |   |         |   |   |        |
|                                                                 |       |   |    | Additional |     |   |          |   | Other    |        |   |   |         |   |   |
|                                                                 | Common     |   | Paid-in |       | Retained |   | Comprehensive |   | Treasury |        |   |   |
|                                                                 | Shares     |   | Capital |       | Earnings |   | Income/(Loss) |   | Shares   |        | Total  |   |
| Balances, January 31, 2011                                           | $1,592,868 |   |    | $3,448,249 |     |   | $93,113,247   |   |     | ($3,201,767 | )      |   | ($10,479,673 | )      |   | $84,472,924 |   |
|                                                                 |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
| Comprehensive income:                                                |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
|    Net income                                         | -          |   |    | -          |     |   | 1,412,507     |   |     | -           |   |   | -            |   |   |        |   |
|    Foreign currency translation                       |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
|      adjustment                             | -          |   |    | -          |     |   | -             |   |     | 468,020     |   |   | -            |   |   |        |   |
|    Interest rate swap,                                |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
|      net of tax of $152                | -          |   |    | -          |     |   | -             |   |     | (259        | )      |   | -            |   |   |        |   |
|        Total comprehensive income |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   | 1,880,268   |   |
|                                                                 |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
| Dividends declared, $.066 per share                                  | -          |   |    | -          |     |   | (967,529      | )      |     | -           |   |   | -            |   |   | (967,529    | )      |
| Stock-based compensation                                             | -          |   |    | 179,826    |     |   | -             |   |     | -           |   |   | -            |   |   | 179,826     |   |
| Stock option transactions                                            | -          |   |    | 1,500      |     |   | -             |   |     | -           |   |   | 41,300       |   |   | 42,800      |   |
| Purchase of 3,717 treasury shares                                    | -          |   |    | -          |     |   | -             |   |     | -           |   |   | (42,800      | )      |   | (42,800     | )      |
| Balances, April 30, 2011                                             | $1,592,868 |   |    | $3,629,575 |     |   | $93,558,225   |   |     | ($2,734,006 | )      |   | ($10,481,173 | )      |   | $85,565,489 |   |

|                                                                 |       |   |    |       |     |   |          |   |     | Accumulated |   |   |         |   |   |        |
|----------------------------------------------------------------------|------------|--------|---------|------------|----------|--------|---------------|--------|----------|-------------|--------|--------|--------------|--------|--------|-------------|
|                                                                 |       |   |    | Additional |     |   |          |   | Other    |        |   |   |         |   |   |
|                                                                 | Common     |   | Paid-in |       | Retained |   | Comprehensive |   | Treasury |        |   |   |
|                                                                 | Shares     |   | Capital |       | Earnings |   | Income/(Loss) |   | Shares   |        | Total  |
| Balances, January 31, 2010                                           | $1,592,868 |   |    | $2,988,950 |     |   | $90,662,820   |   |     | ($3,679,641 | )      |   | ($10,587,413 | )      |   | $80,977,584 |   |
|                                                                 |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
| Comprehensive income:                                                |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
|    Net income                                         | -          |   |    | -          |     |   | 1,411,078     |   |     | -           |   |   | -            |   |   |        |   |
|    Foreign currency translation                       |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
|      adjustment                             | -          |   |    | -          |     |   | -             |   |     | (149,673    | )      |   | -            |   |   |        |   |
|    Interest rate swap,                                |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
|      net of tax of ($748)              | -          |   |    | -          |     |   | -             |   |     | 1,273       |   |   | -            |   |   |        |   |
|        Total comprehensive income |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   | 1,262,678   |   |
|                                                                 |       |   |    |       |     |   |          |   |     |        |   |   |         |   |   |        |   |
| Dividends declared, $.06 per share                                   | -          |   |    | -          |     |   | (877,941      | )      |     | -           |   |   | -            |   |   | (877,941    | ) |
| Stock-based compensation                                             | -          |   |    | 161,472    |     |   | -             |   |     | -           |   |   | -            |   |   | 161,472     |   |
| Stock option transactions                                            | -          |   |    | 3,926      |     |   | -             |   |     | -           |   |   | 208,818      |   |   | 212,744     |   |
| Purchase of 22,803 treasury shares                                   | -          |   |    | -          |     |   | -             |   |     | -           |   |   | (226,666     | )      |   | (226,666    | ) |
| Balances, April 30, 2010                                             | $1,592,868 |   |    | $3,154,348 |     |   | $91,195,957   |   |     | ($3,828,041 | )      |   | ($10,605,261 | )      |   | $81,509,871 |   |

| See accompanying notes to consolidated financial statements. |
|--------------------------------------------------------------|

----

Index

MET-PRO CORPORATION

|                                                                                                                                                                           |               |   |        |   |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------|--------|-------------|--------|
|                                                                                                                                                                           | Three Months Ended |   |
|                                                                                                                                                                           | April 30,          |   |
|                                                                                                                                                                           | 2011               |   | 2010        |   |
|                                                                                                                                                                           |               |   |        |   |
| Cash flows from operating activities                                                                                                                                           |               |   |        |   |
|    Net income                                                                                                                                                   | $1,412,507         |   | $1,411,078  |   |
|    Adjustments to reconcile net income to net           cash provided by (used in) operating activities: |               |   |        |   |
|        Depreciation and amortization                                                                                                        | 481,932            |   | 445,252     |   |
|        Deferred income taxes                                                                                                                | (606               | )      | (597        | )      |
|        Stock-based compensation                                                                                                             | 179,826            |   | 161,472     |   |
|        Allowance for doubtful accounts                                                                                                      | 19,215             |   | (18,557     | )      |
|        Change in operating assets and liabilities:                                                                                          |               |   |        |   |
|            Accounts receivable                                                                                          | (1,636,920         | )      | (1,556,207  | )      |
|            Inventories                                                                                                  | (388,008           | )      | 395,944     |   |
|            Prepaid expenses, deposits and other assets                                                                  | (38,705            | )      | 250,155     |   |
|            Accounts payable and accrued expenses                                                                        | 687,771            |   | 1,608,371   |   |
|            Customers’ advances                                                                                    | (52,906            | )      | (511,077    | )      |
|            Accrued pension retirement benefits                                                                          | (2,776,476         | )      | 112,894     |   |
|            Other non-current liabilities                                                                                | 549                |   | 549         |   |
| Net cash provided by (used in) operating activities                                                                                                                            | (2,111,821         | )      | 2,299,277   |   |
|                                                                                                                                                                           |               |   |        |   |
| Cash flows from investing activities                                                                                                                                           |               |   |        |   |
|    Acquisitions of property and equipment                                                                                                                       | (235,679           | )      | (210,475    | )      |
| Net cash used in investing activities                                                                                                                                          | (235,679           | )      | (210,475    | )      |
|                                                                                                                                                                           |               |   |        |   |
| Cash flows from financing activities                                                                                                                                           |               |   |        |   |
|    Proceeds from new borrowings                                                                                                                                 | 407,731            |   | -           |   |
|    Reduction of debt                                                                                                                                            | (123,023           | )      | (132,845    | )      |
|    Exercise of stock options                                                                                                                                    | 42,800             |   | 212,744     |   |
|    Payment of dividends                                                                                                                                         | (967,445           | )      | (877,021    | )      |
|    Purchase of treasury shares                                                                                                                                  | (42,800            | )      | (226,666    | )      |
| Net cash used in financing activities                                                                                                                                          | (682,737           | )      | (1,023,788  | )      |
| Effect of exchange rate changes on cash                                                                                                                                        | (4,268             | )      | 4,421       |   |
|                                                                                                                                                                           |               |   |        |   |
| Net increase (decrease) in cash and cash equivalents                                                                                                                           | (3,034,505         | )      | 1,069,435   |   |
|                                                                                                                                                                           |               |   |        |   |
| Cash and cash equivalents at February 1                                                                                                                                        | 32,400,814         |   | 30,662,104  |   |
| Cash and cash equivalents at April 30                                                                                                                                          | $29,366,309        |   | $31,731,539 |   |
| See accompanying notes to consolidated financial statements.                                                                                                                   |               |   |        |   |

----

Index

NOTE 1 – SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

----

Index

|                 |   | April 30,  |   | January 31, |
|----------------------|--------|------------|--------|-------------|
|                 |   | 2011       |   |        | 2011 |   |
| Estimated fair value |   | $4,225,625 |   |        | $3,858,888 |   |
| Carrying amount      |   | 3,883,820  |   |        | 3,544,528 |   |

----

Index

|                                                      |           |   | Quoted Prices   |   |        |   |            |
|-----------------------------------------------------------|----------------|--------|-----------------|--------|-------------|--------|-----------------|
|                                                      |           |   | in Active       |   |        |   |            |
|                                                      |           |   | Markets for     |   | Significant |   | Significant     |
|                                                      |           |   | Identical       |   | Observable  |   | Unobservable    |
|                                                      | Balance at     |   | Assets          |   | Inputs      |   | Inputs          |
|                                                      | April 30, 2011 |   |  (Level 1) |   | (Level 2)   |   |  (Level 3) |
| Cash and cash equivalents                                 | $29,366,309    |   | $29,366,309     |   | $0          |   | $0              |
| Short-term investments                                    | 497,155        |   | 497,155         |   | -           |   | -               |
| Long-term investments                                     | 248,063        |   | 248,063         |   | -           |   | -               |
| Cash surrender value -  life insurance policies | 958,291        |   | -               |   | 958,291     |   | -               |
| Interest rate swap agreement                              | (274,719       | )      | -               |   | (274,719    | )      | -               |
|                                                      | $30,795,099    |   | $30,111,527     |   | $683,572    |   | $0              |

|                                                      |             |   | Quoted Prices   |   |        |   |            |
|-----------------------------------------------------------|------------------|--------|-----------------|--------|-------------|--------|-----------------|
|                                                      |             |   | in Active       |   |        |   |            |
|                                                      |             |   | Markets for     |   | Significant |   | Significant     |
|                                                      |             |   | Identical       |   | Observable  |   | Unobservable    |
|                                                      | Balance at       |   | Assets          |   | Inputs      |   | Inputs          |
|                                                      | January 31, 2011 |   |  (Level 1) |   | (Level 2)   |   |  (Level 3) |
| Cash and cash equivalents                                 | $32,400,814      |   | $32,400,814     |   | $0          |   | $0              |
| Short-term investments                                    | 497,155          |   | 497,155         |   | -           |   | -               |
| Long-term investments                                     | 248,063          |   | 248,063         |   | -           |   | -               |
| Cash surrender value -  life insurance policies | 912,417          |   | -               |   | 912,417     |   | -               |
| Interest rate swap agreement                              | (274,308         | )      | -               |   | (274,308    | )      | -               |
|                                                      | $33,784,141      |   | $33,146,032     |   | $638,109    |   | $0              |

----

Index

|                        |                                                                                                        |   Three Months EndedApril 30, |
|-----------------------------|-------------------------------------------------------------------------------------------------------------|------------------------------------|
|                        |                                                                                                        |                               | 2011 |   |   | 2010 |
| Numerator:                  |                                                                                                        |                               |   |   |   |
|                        | Net income                                                                                                  |                               | $1,412,507 |   |   | $1,411,078 |
| Denominator:                |                                                                                                        |                               |   |   |   |
|                        | Weighted average common shares outstanding during the period for basic    computation   |                               | 14,659,117 |   |   | 14,619,000 |
|                        | Dilutive effect of stock-based compensation plans                                                           |                               | 182,603 |   |   | 74,035 |
|                        | Weighted average common shares outstanding during the period for diluted    computation |                               | 14,841,720 |   |   | 14,693,035 |
|                        |                                                                                                        |                               |   |   |   |
| Earnings per share, basic   |                                                                                                        | $.10                               |   |   | $.10 |
| Earnings per share, diluted |                                                                                                        | $.10                               |   |   | $.10 |

----

Index

|                           | Units  |   |
|--------------------------------|--------|--------|
| Non-vested at February 1, 2011 | 12,315 |   |
| Granted                        | -      |   |
| Vested                         | -      |   |
| Forfeited                      | -      |   |
| Non-vested at April 30, 2011   | 12,315 |   |

|                    | Three Months Ended |
|-------------------------|--------------------|
|                    | April 30,          |
|                    | 2011               |   | 2010 |
| Expected term (years)   | 5.0                |   | 5.0 |
| Risk-free interest rate | 1.68% - 2.11%      |   | 1.90% - 3.53% |
| Expected volatility     | 39% - 45%          |   | 29% - 45% |
| Dividend yield          | 2.12% - 2.48%      |   | 1.88% - 2.48% |

----

Index

|     |                            |      |   |           | Weighted     |            |
|----------|---------------------------------|-----------|--------|----------------|--------------|-----------------|
|     |                            |      |   | Weighted       | Average      |            |
|     |                            |      |   | Average        | Remaining    | Aggregate       |
|     |                            | Shares    |   | Exercise Price | Life (years) | Intrinsic Value |
| Options: |                            |      |   |           |         |
|     | Outstanding at February 1, 2011 | 1,274,204 |   | $10.1942       | 6.29         |            |
|     | Granted                         | -         |   | -              |         |            |
|     | Forfeited                       | -         |   | -              |         |            |
|     | Expired                         | (13,000   | )      | 11.7500        |         |            |
|     | Exercised                       | (5,000    | )      | 8.5600         |         |            |
|     | Outstanding at April 30, 2011   | 1,256,204 |   | $10.1846       | 6.13         | $2,177,836      |
|     |                            |      |   |           |         |            |
|     | Exercisable at April 30, 2011   | 934,358   |   | $9.9268        | 5.19         | $1,835,079      |

|                 |   | Options Outstanding |             | Options Exercisable |
|----------------------|--------|---------------------|------------------|---------------------|
|                 |   |                | Weighted Average |                |   |   |   |
|                 |   |                | Remaining        | Weighted Average    |   |   | Weighted Average |
|                 |   | Shares              | Life (years)     | Exercise Price      |   | Shares | Exercise Price |
| Range of prices:     |   |                |             |                |   |   |   |   |   |   |   |   |
| $5.50 – 6.99   |   | 39,825              |             | 1.32                |   | $5.5328 |   |   | 39,825 |   | $5.5328 |   |
| $7.00 – 8.99   |   | 116,450             |             | 3.82                |   | 7.4110 |   |   | 116,450 |   | 7.4110 |   |
| $9.00 – 9.99   |   | 470,344             |             | 6.02                |   | 9.4848 |   |   | 326,949 |   | 9.3948 |   |
| $10.00 – 10.99 |   | 155,337             |             | 5.52                |   | 10.8975 |   |   | 155,337 |   | 10.8975 |   |
| $11.00 – 11.99 |   | 348,800             |             | 6.61                |   | 11.5503 |   |   | 295,797 |   | 11.5871 |   |
| $12.00 – 12.99 |   | 125,448             |             | 9.64                |   | 12.1800 |   |   | - |   | - |   |
|                 |   | 1,256,204           |             | 6.13                |   | $10.1846 |   |   | 934,358 |   | $9.9268 |   |

|             | April 30,2011 |   | January 31,2011 |
|------------------|---------------|--------|-----------------|
| Raw materials    | $11,883,487   |   | $11,639,410     |
| Work in progress | 2,168,300     |   | 1,914,412       |
| Finished goods   | 1,993,564     |   | 1,920,608       |
|             | $16,045,351   |   | $15,474,430     |

----

Index

|                                         | Three Months EndedApril 30, |
|----------------------------------------------|-----------------------------|
|                                         |                        | 2011 |   |   | 2010 |
|   Cash paid during the period for: |                        |   |   |   |   |
|      Interest       |                   | $49,030 |   |   | $55,575 |
|      Income taxes   |                   | 228,584 |   |   | 59,584 |

----

Index

|                                                                 | April 30,  |   | January 31, |
|----------------------------------------------------------------------|------------|--------|-------------|
|                                                                 | 2011       |   | 2011        |
|                                                                 |       |   |        |
| Bond payable, bank, payable in quarterly installments of             |       |   |        |
|  $58,460, plus interest at a rate equal to the greater of       |       |   |        |
|  (i) 16 basis points below the ninety day LIBOR rate       |       |   |        |
|  or (ii) 250 basis points (effective interest rate of 2.50%     |       |   |        |
|  at April 30, 2011), maturing April, 2021, collateralized       |       |   |        |
|  by the Telford, PA building                                    | $2,338,418 |   | $2,396,878  |
|                                                                 |       |   |        |
| Note payable, bank, payable in quarterly installments of             |       |   |        |
|  $37,025 (25,000 Euro), plus interest at a fixed rate of 3.82%, |       |   |        |
|  maturing January, 2016                                         | 703,475    |   | 684,600     |
|                                                                 |       |   |        |
| Equipment note, payable in monthly installments of                   |       |   |        |
|  $13,482, no interest, maturing March 2012                      | 148,297    |   | 188,742     |
|                                                                 |       |   |        |
| Line of credit, $418,911 (282,857 Euro), payable upon                |       |   |        |
|  demand, plus interest at a rate of 70 basis points over        |       |   |        |
|  the thirty day EURIBOR rate (effective interest rate of        |       |   |        |
|  1.94% at April 30, 2011)                                       | 418,911    |   | -           |
|                                                                 |       |   |        |
|                                                                 | 3,609,101  |   | 3,270,220   |
| Less current portion                                                 | 949,149    |   | 532,540     |
|                                                                 | 2,659,952  |   | 2,737,680   |
| Fair market value of interest rate swap liability                    | 274,719    |   | 274,308     |
| Long-term portion                                                    | $2,934,671 |   | $3,011,988  |

----

Index

| As of      |       |   |
|------------|------------|--------|
| April 30,  |       |   |
| 2012       | $949,149   |   |
| 2013       | 381,940    |   |
| 2014       | 381,940    |   |
| 2015       | 381,940    |   |
| 2016       | 344,915    |   |
| Thereafter | 1,169,217  |   |
|       | $3,609,101 |   |

|                                             | April 30,   |    | January 31, |   |
|--------------------------------------------------|-------------|---------|-------------|--------|
|                                             | 2011        |    | 2011        |   |
| Interest rate swap, net of tax                   | ($173,073   | )  | ($172,814   | )      |
| Foreign currency translation adjustment          | 1,506,143   |    | 1,038,123   |   |
| Minimum pension liability adjustment, net of tax | (4,067,076  | )  | (4,067,076  | )      |
|                                             | ($2,734,006 | )  | ($3,201,767 | )      |

|                       |   | Three Months EndedApril 30, |
|----------------------------|--------|-----------------------------|
|                       |   | 2011                        |   |  2010 |   |
| Interest income            |   | $44,543                     |   | $81,234 |   |
| Other miscellaneous income |   | 61,443                      |   | 36,234 |   |
|                       |   | $105,986                    |   | $117,468 |   |

----

Index

|                               | Three Months EndedApril 30, |   |
|------------------------------------|-----------------------------|--------|
|                               |  2011                  |   |  2010 |   |
| Service cost                       | $51,400                     |   | $17,000 |   |
| Interest cost                      | 280,400                     |   | 272,750 |   |
| Expected return on plan assets     | (350,500                    | )      | (243,250 | ) |
| Amortization of transition asset   | -                           |   | - |   |
| Amortization of prior service cost | -                           |   | - |   |
| Recognized net actuarial loss      | 52,500                      |   | 56,000 |   |
| Net periodic pension cost          | $33,800                     |   | $102,500 |   |

----

Index

----

Index

|                                            | Three Months EndedApril 30, |
|-------------------------------------------------|-----------------------------|
|                                            | 2011                        |   | 2010 |
| Net sales                                       |                        |   |   |
| Product Recovery/Pollution Control Technologies | $8,331,972                  |   | $11,013,225 |
| Fluid Handling Technologies                     |  9,553,104             |   |  6,530,571 |
| Mefiag Filtration Technologies                  |  3,139,917             |   |  2,434,249 |
| Filtration/Purification Technologies            | 2,404,910                   |   | 2,299,032 |
|                                            | $23,429,903                 |   | $22,277,077 |
|                                            |                        |   |   |
| Income (loss) from operations                   |                        |   |   |
| Product Recovery/Pollution Control Technologies | ($480,285                   | ) | $516,161 |
| Fluid Handling Technologies                     |  2,240,696             |   |  1,288,796 |
| Mefiag Filtration Technologies                  | 221,472                     |   | 206,519 |
| Filtration/Purification Technologies            | 101,093                     |   | 91,564 |
|                                            | $2,082,976                  |   | $2,103,040 |

|                                            |         |   |         |
|-------------------------------------------------|--------------|--------|--------------|
|                                            |         |   |         |
|                                            | April 30,    |   | January 31,  |
|                                            | 2011         |   | 2011         |
| Identifiable assets                             |         |   |         |
| Product Recovery/Pollution Control Technologies | $33,147,390  |   | $34,003,251  |
| Fluid Handling Technologies                     | 20,072,721   |   | 18,114,257   |
| Mefiag Filtration Technologies                  | 14,193,775   |   | 12,814,143   |
| Filtration/Purification Technologies            | 8,235,261    |   | 8,369,385    |
|                                            | 75,649,147   |   | 73,301,036   |
| Corporate                                       | 31,826,823   |   | 34,745,292   |
|                                            | $107,475,970 |   | $108,046,328 |

----

Index

----

Index

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

----

Index

MET-PRO CORPORATION

|                                |   | Three Months Ended |   |
|-------------------------------------|--------|--------------------|--------|
|                                |   | April 30,          |   |
|                                |   | 2011               |   | 2010 |   |
|                                |   |               |   |   |   |
| Net sales                           |   | 100.0              | %      | 100.0 | % |
| Cost of goods sold                  |   | 65.6               | %      | 64.2 | % |
| Gross profit                        |   | 34.4               | %      | 35.8 | % |
|                                |   |               |   |   |   |
| Selling expenses                    |   | 12.4               | %      | 13.2 | % |
| General and administrative expenses |   | 13.1               | %      | 13.2 | % |
| Income from operations              |   | 8.9                | %      | 9.4 | % |
|                                |   |               |   |   |   |
| Interest expense                    |   | (0.2               | %)     | (0.3 | %) |
| Other income, net                   |   | 0.4                | %      | 0.5 | % |
| Income before taxes                 |   | 9.1                | %      | 9.6 | % |
|                                |   |               |   |   |   |
| Provision for taxes                 |   | 3.1                | %      | 3.3 | % |
| Net income                          |   | 6.0                | %      | 6.3 | % |

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Index

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Index

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Index

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Index

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Index

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Index

|   | ·  | the write-down of goodwill, as a result of the determination that the acquired business is impaired.  Flex-Kleen, which initially performed well after being acquired by Met-Pro, thereafter had several years of declining performance which we attributed primarily to a general weakness in its served markets, followed by improved performance in the fiscal years ended January 31, 2007, 2008 and 2009.  During the fiscal year ended January 31, 2010, Flex-Kleen’s net sales and operating profit were below the projections in our impairment model, which we believe was a reflection of the downturn in global business and economic conditions during this period of time and was not due to any new development specific to Flex-Kleen.  In the fiscal year ended January 31, 2011, Flex-Kleen’s net sales were below that which is required by our impairment model, while the fiscal year 2011 operating profit was slightly higher than the amount which is required by our impairment model.  During the fiscal year ended January 31, 2011, we performed an impairment analysis of the $11.1 million of goodwill that the Company carries for Flex-Kleen and concluded that no impairment had occurred.  Our impairment model requires that Flex-Kleen’s sales and operating profit improve during each of the next several fiscal years in order for us to avoid a potential impairment charge. For the three-month period ended April 30, 2011, the annualized projection for net sales and operating profit for Flex-Kleen currently exceeds the projections used in our annual impairment model for the fiscal year ended January 31, 2012 and we anticipate that Flex-Kleen’s performance during the fiscal year ending January 31, 2012 will be sufficient to avoid an impairment charge. Our projections are forward-looking statements where the actual results may not be as we presently anticipate; |
|--------|--------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   | ·  | materially adverse changes in economic conditions (i) in the markets served by us or (ii) in significant customers of ours;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|   | ·  | material changes in available technology;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|   | ·  | adverse developments in the asbestos cases that have been filed against the Company, including without limitation the exhaustion of insurance coverage, the imposition of punitive damages, the insolvency or liquidation of our insurance carriers, or other adverse developments in the availability of insurance coverage. On April 27, 2011, a liquidation order was entered against Atlantic Mutual Insurance Company, who had been providing defense and indemnity to the Company, and its affiliate, Centennial Insurance Company, who provided umbrella coverage to the Company. It appears that our remaining insurers have assumed prospectively the share of the defense and indemnity obligations that Atlantic Mutual Insurance Company had agreed to assume, and despite the liquidation of Atlantic Mutual Insurance Company and Centennial Insurance Company, the Company believes that its insurance coverage is adequate for the cases currently pending against the Company and for the foreseeable future, assuming a continuation of the current volume, nature of cases and settlement amounts; however, the Company has no control over the number and nature of cases that are filed against it, nor as to the financial health of its insurers or their position as to coverage;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|   | ·  | changes in accounting rules promulgated by regulatory agencies, including the SEC, which could result in an impact on earnings;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|   | ·  | the cost of compliance with Sarbanes-Oxley and other applicable legal and listing requirements, and the unanticipated possibility that Met-Pro may not meet these requirements;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|   | ·  | weaknesses in our internal control over financial reporting, which either alone or combined with actions by our employees intended to circumvent our internal control over financial reporting, to violate our policies, or to commit fraud or other bad acts, could lead to incorrect reporting of financial results.  We believe that our internal control over financial reporting as of April 30, 2011 is effective; however, there are limits to any control system and we cannot give absolute assurance that our internal control is effective or that financial statement misstatements will not occur or that policy violations and/or fraud within the Company will not occur;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|   | ·  | unexpected results in our product development activities;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |

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Index

|   | ·  | loss of key customers;                                                                                                                                                                           |
|--------|--------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   | ·  | changes in product mix and the cost of materials, with effect on margins;                                                                                                                        |
|   | ·  | changes in our existing management;                                                                                                                                                              |
|   | ·  | exchange rate fluctuations;                                                                                                                                                                      |
|   | ·  | changes in federal laws, state laws and regulations;                                                                                                                                             |
|   | ·  | lower than anticipated return on investments in the Company’s defined benefit plans, which could affect the amount of the Company’s pension liabilities;                             |
|   | ·  | the assertion of claims that the Company’s products, including products produced by companies acquired by the Company, infringe third party patents or have caused injury, loss or damage; |
|   | ·  | the effect of acquisitions and other strategic ventures;                                                                                                                                         |
|   | ·  | failure to properly quote and/or execute customer orders, including misspecifications, design, engineering or production errors;                                                                 |
|   | ·  | the cancellation or delay of purchase orders or shipments;                                                                                                                                       |
|   | ·  | losses related to international sales; and/or                                                                                                                                                    |
|   | ·  | failure in execution of acquisition strategy.                                                                                                                                                    |

Item 3.  Qualitative and Quantitative Disclosures About Market Risk

Item 4.  Controls and Procedures

----

Index

MET-PRO CORPORATION

----

Index

Item 1A.  Risk Factors

Item 2.   Unregistered Sales of Equity Securities and Use of Proceeds

| (a)  | During the first quarter ended April 30, 2011, we did not sell any of our equity securities that were not registered under the Securities Act of 1933. |
|-----------|--------------------------------------------------------------------------------------------------------------------------------------------------------|
|      |                                                                                                                                                   |
| (b)       | Not applicable.                                                                                                                                        |
|      |                                                                                                                                                   |
| (c)       | The following table summarizes Met-Pro’s purchases of its common shares for the quarter ended April 30, 2011:                                    |

| Period              |   | TotalNumber of SharesPurchased |   | AveragePrice PaidPer Share                                           |   | TotalNumber ofSharesPurchasedAs Part ofPubliclyAnnouncedPlans orPrograms |   | MaximumNumber ofSharesThat MayYet bePurchasedUnder thePlan orPrograms |            (1) |
|---------------------|--------|--------------------------------|--------|----------------------------------------------------------------------|--------|--------------------------------------------------------------------------|--------|-----------------------------------------------------------------------|------------------------------------------------------------------|
|                |   |                           |   |                                                                 |   |                                                                     |   |                                                                  |                                                             |
| February 1-28, 2011 |   | 0                              |   | $           - |   | 0                                                                        |   | 187,357                                                               |                                                             |
| March 1-31, 2011    |   | 3,717                          |   | 11.515                                                               |   | 3,717                                                                    |   | 183,640                                                               |                                                             |
| April 1-30, 2011    |   | 0                              |   | -                                                                    |   | 0                                                                        |   | 183,640                                                               |                                                             |
| Total               |   | 3,717                          |   | $ 11.515                                                             |   | 3,717                                                                    |   | 183,640                                                               |                                                             |

| (1)   | On November 3, 2008, our Board of Directors authorized a common share repurchase program that was publicly announced on November 5, 2008, for up to 300,000 shares.  The program has no fixed expiration date. |
|-----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

Item 3.   Defaults Upon Senior Securities

Item 4.   Submission of Matters to a Vote of Security Holders

Item 5.   Other Information

----

Index

| Item 6.                                                                                          | Exhibits              |
|--------------------------------------------------------------------------------------------------|-----------------------|
|                                                                                             |                  |   |
|                  | (a)    | Exhibits Required by Item 601 of Regulation S-K |
|                                                                                             |                  |   |
|                                                                                             |                  | Exhibit No. |   | Description |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  | (31.1) |   | Certification of the Chief Executive OfficerPursuant to Section 302 of theSarbanes-Oxley Act of 2002.* |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  | (31.2) |   | Certification of the Chief Financial OfficerPursuant to Section 302 of theSarbanes-Oxley Act of 2002.* |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  | (32.1) |   | Certification of the Chief Executive OfficerPursuant to 18 U.S.C. Section 1350, as adoptedPursuant to Section 906 of Sarbanes-Oxley Act of 2002.* |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  | (32.2) |   | Certification of the Chief Financial OfficerPursuant to 18 U.S.C. Section 1350, as adoptedPursuant to Section 906 of Sarbanes-Oxley Act of 2002.* |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  |   |   |   |
|                                                                                             |                  |   |   |   |
| *  Filed herewith.                                                                     |                  |   |

----

Index

MET-PRO CORPORATION

|         |   | Met-Pro Corporation                 |
|--------------|--------|-------------------------------------|
|         |   | (Registrant)                        |
|         |   |                                |
|         |   |                                |
| June 2, 2011 |   | /s/ Raymond J. De Hont              |
|         |   | Raymond J. De Hont                  |
|         |   | Chairman, Chief Executive Officer   |
|         |   | and President                       |
|         |   |                                |
|         |   |                                |
| June 2, 2011 |   | /s/ Gary J. Morgan                  |
|         |   | Gary J. Morgan                      |
|         |   | Senior Vice President of Finance,   |
|         |   | Secretary and Treasurer, Chief      |
|         |   | Financial Officer, Chief Accounting |
|         |   | Officer and Director                |