The MAC 10 FFU, fan filter Unit is only 13 1/4" high and weighs only 56 pounds. A motorized Ceiling Module fan filter Unit. This reduced size and weight has not reduced quality. The MAC10 fan filter unit, FFU, 2 x 2 is equipped with a HEPA filter that is 99.99% efficient on 0.3 micron and larger and the filter face is 100% scanned as per Federal Standard 209- IES RPCC-001-86 and ISO 14644-1. 1" washable pre-filter included at no extra cost. (20% ASHRAE).