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| x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |
|---|--------------------------------------------------------------------------------------|

| o | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |
|---|------------------------------------------------------------------------------------------|

| Pennsylvania                                                   |   | 23-1683282                           |
|----------------------------------------------------------------|--------|--------------------------------------|
| (State or other jurisdiction of incorporation or organization) |   | (I.R.S. Employer Identification No.) |
|                                                           |   |                                 |
| 160 Cassell Road, P. O. Box 144                                |   |                                 |
| Harleysville, Pennsylvania                                     |   | 19438                                |
| (Address of principal executive offices)                       |   | (Zip Code)                           |
|                                     |   | Name of each exchange on |
|------------------------------------------|--------|--------------------------|
| Title of each class                      |   | which registered         |
| Common Shares, par value $0.10 per share |   | New York Stock Exchange  |
| Large accelerated filero | Accelerated filer x | Non-accelerated filero | Smaller reporting company o |
|--------------------------|---------------------|------------------------|-----------------------------|
|                                                                                                                                                                                                                                             | Form 10-K/APart Number |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------|
| Portions of registrant’s definitive proxy statement, in connection with its 2013 Annual Meeting of Shareholders,to be filed with the Securities and Exchange Commission within 120 days after the close of registrant’s fiscal year. | III                    |

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| (31.1) | Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------|
|   |                                                                                                                                                  |
| (31.2) | Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                |
|   |                                                                                                                                                  |
| (32.1) | Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as Adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 |
|   |                                                                                                                                                  |
| (32.2) | Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as Adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 |

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|         |   | MET-PRO CORPORATION |
|--------------|--------|---------------------|
|         |   |                |   |
| July 1, 2013 |   | By:            | /s/ Raymond J. De Hont |
| Date         |   |                | Raymond J. De Hont |
|         |   |                | Chief Executive Officer and President |
|         |   |                | (duly authorized officer) |

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