• Fully insulated housing; with rotating self-closing aluminum flaps
• Fully enclosed air chamber stops drafts, dust and reduces noise
• Telescopic housing for doors 13 ⁄4 –215⁄16" (44.5–75mm) thick Spacers required for thinner doors (see below)
• Available in wide format to accommodate large envelopes
• Soft rubber weather exterior seal
• Insulating gaskets in all critical areas
