Standard Size #641 Register Boxes are lined with 1'' Ductliner to provide an R-Factor of R-4. The #641 Register Box is 4'' Tall with Snap-Rail Flange
- Series 641-R4
- Collar Size 6
Standard Size #641 Register Boxes are lined with 1'' Ductliner to provide an R-Factor of R-4. The #641 Register Box is 4'' Tall with Snap-Rail Flange