Indoor air quality, whole house fans, exhaust and ventilation fans

4" inlet/outlet adjustable diffuser SKU: SP-BOR-100 This attractive diffuser is used with the Multi-AireIIP and Multi-AireIIN balanced ventilation systems. The center portion turns clockwise and counter clockwise allowing adjustable air flow. Made of durable plastic, it is equipped with 3 mounting screw holes and a rubber washer ensuring a snug fit in a 4" duct. Price listed is for 1 each. For quantity pricing call 800-222-5932. Shipping costs within the Continental U.S. only all others please call for quote.   Price:  $18.00 ea. Shipping:  $15.00 Quantity