The 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.
Easily assembles using foil tape (Assembly required)
Provides accommodation for return air filter grills
Easy， more flexible， installation
R-6 insulation
Overall assembled size: 23 in. x 23 in. x 7.5 in
Interior dimensions: 20 in. x 20 in. x 6 in.
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