This Master Flow 12 in. x 8 in. Duct Board Insulated Register Box comes pre-wrapped with R6 fiberglass insulation for your convenience. It's ideal for connecting an insulated flexible duct to a grille.
- Stainless-steel and fiberglass 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)