For sale is a NEW NUCLEAR Co. Entrance Recilculation Gas Filter; 550 CFM; 23.5 x 17 x 3" AESE FILTER MATERIAL CHARCOAL, MIL-C-13724, GRADE 3 AND CHARCOAL, MIL-C-13724, GRADE 4 ADNM FRAME MATERIAL ALUMINUM ALLOY ABKW OVERALL HEIGHT 23.460 INCHES MINIMUM AND 23.540 INCHES MAXIMUM ABHP OVERALL LENGTH 3.080 INCHES MINIMUM AND 3.160 INCHES MAXIMUM ABMK OVERALL WIDTH 17.340 INCHES MINIMUM AND 17.420 INCHES MAXIMUM BTLT III FILTRATION RATE 550.000 CUBIC FEET PER MINUTE NOMINAL