Exhibit 10(h)
                                                                   June 26, 2000




Mr. William L. Kacin
c/o Met-Pro Corporation
160 Cassell Road
Harleysville, PA 19438

Dear Mr. Kacin:

Reference is made to the definition of "Change of Control" found in Section 1(a)
of the Key Employee  Severance  Agreement  that you executed on October 12, 1995
with Met-Pro Corporation.  With this letter agreement,  we hereby amend this Key
Employee  Severance  Agreement by deleting Section 1(a) thereof and replacing it
with the following:

"(a) Change of Control.  For purposes of this  Agreement,  a "Change of Control"
shall be deemed to have occurred:

        (i)     If any "person" or "group of persons",  which person or group of
                persons  are not part of  present  Management  and are acting in
                concert  (as the term  "person"  is used in  Sections  13(d) and
                14(d) of the  Securities  Exchange Act of 1934,  as amended (the
                "Act") becomes the "beneficial  owner" (as defined in Rule 13d-3
                promulgated  under the Act) directly or indirectly of securities
                of the Corporation  representing thirty (30%) percent or more of
                the combined voting power of the Corporation's  then outstanding
                securities; or,

        (ii)    Of at any time there shall be a change in the composition of the
                Corporation's Board of Directors resulting in a majority of such
                Directors  as of the date hereof no longer  constituting  such a
                majority;   provided,   however,   that  in   making   any  such
                determination  as to  change  in  composition,  there  shall  be
                excluded  any change  where the new  Director  was elected by or
                upon the recommendation of such present majority; or

        (iii)   If the  approval by the  stockholders  of the  Corporation  of a
                reorganization,  merger or  consolidation,  in each  case,  with
                respect  to  which   persons  who  were   stockholders   of  the
                Corporation immediately prior to such reorganization,  merger or
                consolidation  do not,  immediately  thereafter,  own more  than
                fifty  (50%)  percent  of  the  combined  voting  power  of  the
                reorganized,   merged   or   consolidated   Corporation's   then
                outstanding securities entitled to vote generally

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                in the election of directors or with respect to a liquidation or
                dissolution   of  the   Corporation   or  the  sale  of  all  or
                substantially all of the Corporation's assets; or,

        (iv)    There  shall be a Change  of  Control  as  defined  by any other
                agreement or plan to which the Corporation is party."

Except as set forth in this letter agreement, there are no other changes or
amendments to the Key Employee Severance Agreement, which remains in full force
and effect.

                                                     Very truly yours,

                                                     MET-PRO CORPORATION



                                             By: /s/ Gary J. Morgan
                                                 -------------------------------
                                                 Gary J. Morgan
                                                 Vice President - Finance

ACCEPTED AND AGREED:



/s/ William L. Kacin
--------------------------
William L. Kacin