602R6 DucTite® Register Box with Snap Rail Flange conforms to 2009 IRC M601.4.1 which requires joints and seams to be "Substantially Airtight". No 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 Manufacturing Company.
M&M DucTite® Insulator Register Box, 6 in Collar, 10 in Length, 8 in Width, 30 ga, Steel, Galvanized, Domestic