(400 to 1,100 cfm) These galvanized steel units are specifically sized to handle commercial and industrial dedicated ventilation applications. The efficiency, depending on air flow, can be adjusted from 70% to 95% thermal efficiencies. Packages include modular, man-portable ERV unit, Fans, Speed Controllers, Filter Boxes, and Intake Louvers. A 120 VAC outlet is needed. Speed Controllers can be installed in a standard duplex box. Just add ductwork!