No 645R6 register boxes have adjustable 45 deg collars and tabs. The registers boxes are lined with 1 1/2 in R-6 duct liner.
M&M Insulated Register Box With Adjustable Collar and Tab, Series: 645R6, 5 in, 8 in Length, 4 in Width, 45 deg Angle, 30 ga, Fiberglass/Steel, Galvanized, Silver, R-Value: R-6
- Series 645R6
- Width 4 in
- Length 8 in
Catalog- Lined with 1-1/2 in ductliner providing R-Factor of R-6