The Petsafe Premium Aluminum Wall Entry Pet Door has a double flap (flap on both sides of the wall). The air-space between the double flap design of the Petsafe Wall Entry Pet Door double flap wall mount will have a higher insulation Q factor--much better than a single flap pet door. Dual flaps have less wind noise. Thus, the finished look of a dual flap, double door wall mounted pet door is more attractive, having a flush look on both sides of the wall.

General Info about the Petsafe^® Aluminum Wall Entry Pet Door:

• Applications of the Wall Entry Pet Door: The Wall Entry Pet Door can be used in a number of different wall materials including all types of siding, stucco, and even brick (additional support suggested for brick).
• Extension kit sold separately to extend beyond 7 1/4" thick for some stucco walls or brick exteriors.

Size	Model Number	Product Dimensions	Flap Size	Product Weight
Petsafe Aluminum Wall Entry Pet Door Small	PPA11-10915	7.5" x 9.63" x 13.88"	5" x 7"	5 lbs
Petsafe Aluminum Wall Entry Pet Door Medium	PPA11-10916	7.5" x 12.88" x 17.88"	8" x 11"	8 lbs
Petsafe Aluminum Wall Entry Pet Door Large	PPA11-10917	7.5" x 14.81" x 22"	10" x 15"	11.15 lbs