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Jun 16
2010
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To test levels of air tightness and locate leaks in a home, a large calibrated fan called a blower door is used to evacuate air from the interior. This fan depressurizes the building down to -50 pascals, which is the equivalent of a 25 mph wind hitting the house from all directions at once. Under this pressure differential, any areas contributing to leakage can be found and remedied.

Pet Door Blog
Do we offer a high performance pet door? Well, our pet door exceeded the Passive House air-tightness test requirements by a factor of 3. You don't have to take my word. Below is a story written by Blake J. Bilyeu |SHP|CPHC.
From humble beginnings to a pat on the back, Freedom Pet Pass was recognized as the region's best small business. All the success our company has had is centered on a passion to deliver the customer the absolute best sealing and most energy efficient pet door they have ever seen.
Imagine the ultimate magnetic dog door. Forget about the magnetic dog doors you have already seen that leak air, water, and debris into your home. I talking about the ultimate magnetic dog door that lets your companion easily come and go while sealing airtight just like a refrigerator door seals shut. Wouldn’t that give you the peace of mind you need to cut that hole into your door or exterior wall so your best buddy has his own portal to the backyard.