602R6 DucTite® register box with snap rail flange conforms to 2009 IRC M601.4.1 which requires joints and seams to be "substantially airtight". #602R6 DucTite® register boxes are insulated at the plant with a true R-6 DucTite® insulator of EPS. DucTite® is a registered trademark of M&M.
M&M DucTite™ Insulated Register Box, Series: 602R, 5 in Collar, 10 in Length, 6 in Width, Steel, Galvanized