A blower door test determine's a home's airtightness. Here is how it works: 👉A blower door is a essentially a powerful fan mounted into the frame of an exterior doorway in your home. 👉The fan pulls air out of the house, lowering the air pressure inside. 👉The higher outside air pressure then flows in through all your cracks, gaps, wiring penetrations etc You should also use an infrared camera to look at the walls, ceilings, and floors, to find specific locations where insulation is missing and

21K views · 71 reactions | My inspector David is conducting a blower door test at @generations_mb . A blower door test measures the air tightness of a building. We can determine how much air is leaking from the house, so we can fix it during construction  | Mike Holmes | Facebook