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 Register Box, Series: 645R6, 7 in Collar, 12 in Length, 6 in Width, Steel, Galvanized
- Series 645R6
- Width 6 in
- Length 12 in
Catalog- Adjustable 45 deg collar