Model CM3000 Insulated version of the CM3000 for use in unconditioned spaces such as attics and garages. Insulated outer shell prevents condensation problems.Fantech’s Whole House HEPA installs on your home’s forced air furnace/air handler or can be used as an independent system mounted in the attic, crawl space or closet. The unit is small, compact and very affordable. A powerful 240 CFM fan directs air through a series of three filters then delivers clean, safe, healthy air back into your entire home. CM3000 20" X 16" X 10.5" - compact Easy to install Collar Mount Unit c/w four collars two pieces of UL listed 8" flexible duct and hanging chains.