The ST-100 for ceiling applications uses R-40 EPS Insulation with the door and frame made of high impact plastic.
There is a perimeter gasket to seal out the cold drafts. It's paintable and installs in a standard 22.5" X 30" R.O.
WARNING:Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Sun Valley Supply 3737 W Buckeye Road, Phoenix AZ, 85009 US