Insulated pet doors use the same construction as the world’s leading cooler/freezer doors. 
They are well insulated with high-density polystyrene and faced on each side with .063 satin anodized aluminum attached to an extruded aluminum frame. These pet doors will not rust, crack or chip. The 4.7 R Factor will maintain a 30° temperature difference in extreme weather conditions – heat, cold and precipitation. They are fully gasketed to eliminate drafts and the seal is provided by a replaceable, neoprene, double-wiper gasket on the door top, sides and bottom.
Our pet doors are easy to install; the telescoping frame can be installed in any door 1 3/4” thick or in any wall 1 3/4″ to 6″ thick. They have a heavy-duty frame construction with double acting hinge; they close quietly and automatically with the concealed hinge and the door can be locked and unlocked from inside for security and pet control.