• 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