20 x 16 " Ceiling Box made of Galvanized Sheet Metal.(Blank Box cut your own hole size)
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20 x 16" Return Air Box is made of Galvanized Sheet Metal. Box Enclosed on one end for attaching the proper sized start collar (Start Collar Sold Seperatly) The return air is drawn through this box with a filter return air grill attached in most. The air passing through this system in now being cleaned and and or re-heated and or re-cooling the air for maxium efficency. In all areas over 2000 square feet, we strongly recommend two (2) return air duct systems for efficency and noise control. Back to the heating and cooling appliance this system balances the air flow in a large interior and muffles noise of moving airflow. Sizes range from 20"x14" to 30"x30". For Tape and or duct Sealant visit our Accessories department. E-mail us for your special sizing needs.