ZLPSP21H23E1E 21-1/2X23-5/16X1-E-P8 21-1/2" X 23-5/16" X 1" EXACT MERV 10 PLEATED FILTER **MUST BE ORDERED IN CASE QUANTITIES TO GET THIS PRICE ** (ZLPSP21H23E1E) (12/CASE) GLASFLOSS