Why Tight Homes Need Fresh Air 💨 | Blower Door Test Explained! We’re breaking down what happens when you run a blower door test on homes insulated with foam, fiberglass, or cellulose and why it’s not just about sealing your house tight. When a home is insulated correctly, it becomes so airtight that fresh air can’t naturally circulate which is great for energy savings, but tough on indoor air quality. That’s where mechanical ventilation systems come in. Adding a fresh air intake to your HVAC ke

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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