Exhibit 10.ac


    
      
        	
                Exhibit
                  (10.ac)

              


      

    

     

     

    THIRD
      AMENDMENT TO THE

    MET-PRO
      CORPORATION SALARIED PENSION PLAN

    Amended
      and Restated Effective September 1, 2000

    
 

    
      	
              This
                Third Amendment to the Met-Pro Corporation Salaried Pension Plan
                (the
                “Plan”) is made by Met-Pro Corporation (the “Company”) and is effective as
                of March 28, 2005.

              
 

              WITNESSETH

              


              WHEREAS,
                the Company maintains the Plan for the benefit of its eligible
                employees;

              


              WHEREAS,
                Section
                16.1 of the Plan permits the Company to amend the Plan; and 

              


              WHEREAS,
                the
                Company desires to amend the Plan, effective March 28, 2005, to eliminate
                the mandatory distribution of benefits with an Actuarial Equivalent
                present value not exceeding $5,000.

              


              NOW
                THEREFORE, the
                Plan is hereby amended, effective March 28, 2005, as follows:

              


              1.    Section
                8.1 is amended by deleting the following parenthetical
                phrase:

              


              “(if
                the Actuarial Equivalent present value of such benefit as of the
                Participant’s Annuity Starting Date or at the time of any prior
                distribution is in excess of $5,000)”

              


              2.    Section
                8.2 is deleted in its entirety and it is retitled “Reserved.”

              


              3.    The
                second sentence of Section 8.3 is amended to read as follows:

              


              A
                Participant’s Annuity Starting Date shall be the earliest of (a) the first
                day of the month coincident with or next following the day of the
                Participant’s Retirement, (b) the first day of the month coincident with
                or next following the Participant’s Normal Retirement Date if the
                Participant has a Separation from Service prior to that time, unless
                the
                Participant elects under Section 8.4 to commence to receive distribution
                prior to his Normal Retirement Date, and (c) effective for all
                Participants (except Participants that attained age 701⁄2 after January 1,
                1988 and before January 1, 2003, or Participants who are Five Percent
                Owners during the Plan Year ending with or within the calendar year
                in
                which they attain age 701⁄2 or subsequent Plan Year), the first day of April
                immediately following the calendar year in which the Participant
                retires
                or attains age 701⁄2, whichever occurs later.

              


              4.    The
                first sentence of Section 8.4 is amended to read as follows:

              


              A
                Participant who has a Separation from Service before his Normal Retirement
                Date with a Vested Interest may elect to have distribution of his
                Retirement Benefit commence before his Normal Retirement
                Date.

              


              


              IN
                WITNESS WHEREOF,
                the Company has caused this Third Amendment to be executed by its
                duly
                authorized officer this 31st
                day of August, 2005.

            


    

     

    
      	 	 	 	 	 	 	 
	
              ATTEST:

            	 	
              Met-Pro
                Corporation

            
	 	 	 	 	 	 	 
	
              By

            	/s/
              Gary J. Morgan	 	
              By

            	/s/
              Raymond J. De Hont
	 	 	 	 	 	 	 
	
              Title:

            	 	
              Vice
                President-Finance

            	 	Title:	 	
              President