Compact blower and filter unit assists in making a controlled environment. Filter Package connects to existing duct work. Easily positioned. Can be hung with return air ducts, mounted on side walls, drawing air in at floor level and returned to the unit. Compact, self-contained filter package provides dust-free atmosphere. Standard units: 900 CFM unit, 1000 CFM unit. Custom sizes available. 16 ga. steel, black. Easily wired.