The Endura Flap™ pet doors show high insulation values

Endura Flap™ Has Superior Insulation

Dual Pane Insulated with Heat Transfer Barriers

Insulation

Insulation is not as important as a good seal. For example, the best insulating windows available aren't much help if you leave them open 1/2"!

After achieving a good seal, however, insulation is very important. A single-walled flap is not satisfactory for the same reason that single-pane glass is not: It just doesn't insulate very well. While single-pane glass is completely replaced these days by dual-pane glass, most pet doors sold on the market today provide no more than a 1/ 8" thickness of vinyl between the living area of the home and the outside weather.

The Endura Flap™ consists of a sealed unit that is slightly thicker than a dual-pane glass unit and provides comparable insulation qualities.

Heat Transfer Barriers

Heat transfer across an air space in a sealed unit is caused by air currents moving within the space. These currents are caused by the continuous heating and cooling of the air inside the unit.

The Endura Flap™ is divided by horizontal barriers which serve to reduce the effect of these air currents.

A trade Off - We could have filled the flap interior with insulation for better insulation performance. We didn't for the same reason that dual pane windows aren't filled with insulation: It's better if you can see through.