EXHIBIT 2.1 Stock Purchase Agreement by and between the Registrant and the shareholders of Precisionaire dated July 1, 1996, previously filed as Exhibit 10.1 of the Company's 10-Q for the period ending June 30, 1996 incorporated herein by reference.

                                 EXHIBIT 2.1


		Stock Purchase Agreement by and between the Registrant and the 
shareholders of Precisionaire dated July 1, 1996, previously filed as Exhibit
10.1 of the Company's 10-Q for the period ending June 30, 1996 incorporated
herein by reference.