This Master Flow 12 in. x 8 in. Duct Board Insulated Register Box - R6 is pre-wrapped with R6 fiberglass insulation to help provide high thermal efficiency. Use this register box to transition from round pipe or insulated flexible duct to a grill or air register (pipe， duct， grill and air register not included). This versatile box is compatible with multiple collar sizes for your convenience.
Galvanized steel and duct board insulation construction
Connects round pipe or an insulated flexible duct to an air register or grille
Ready to install and pre-wrapped with R6 fiberglass insulation
Fits many collar sizes
Insulated lining absorbs system noise and helps control condensation
Maximum temperature rating of 390 degrees Fahrenheit
Seal seams with code-approved mastic， sealant or duct tape (not included)
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