Improve your heating, ventilation and airImprove your heating, ventilation and air conditioning duct system by installing this Master Flow 15 in. x 13 in. Ductboard Triangular Terminal Box - R-6 that features an insulated fiberglass design. Insulated ductboard for improved temperature regulation. Product is "knocked down" for shipping and must be assembled.View Full Product Description
21 in. x 28 in. Return Air Box Assembly
Ensure proper return air flow for your 21Ensure proper return air flow for your 21 in Winchester residential electric furnace application with this easy to assemble return air box. The flexible design allows for connection of a new or existing side air return on either side based on the placement of the reinforced sheet metal panel of the return air box assembly. Plus, the knock-down design simplifies transporting to the job by taking up very little space.View Full Product Description
17.5 in. x 28 in. Return Air Box Assembly
Ensure proper return air flow for your 17.5Ensure proper return air flow for your 17.5 in Winchester residential electric furnace application with this easy to assemble return air box. The flexible design allows for connection of a new or existing side air return on either side based on the placement of the reinforced sheet metal panel of the return air box assembly. Plus, the knock-down design simplifies transporting to the job by taking up very little space.View Full Product Description
20 in. x 20 in. Duct-board Return Air Box
The Duct-board Return Air Box is an R6 insulatedThe Duct-board Return Air Box is an R6 insulated box that installs traditionally in a ceiling. Can accept any size collar up to 18 in. Diameter (not included). Used as a central return vent box (Filter Grill Not included). Can be easily cut to size. Product is "knocked down" for shipping and must be assembled.View Full Product Description
