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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22K views · 206 reactions | The pen test before this is in the same order- these pens are numbered on the bottom of the pen and the number corresponds with a color name! I’ll get a post of the numbers with their colors ready soon! I will definitely use these for lettering and underlining in my Bible! | Memories By Meyers | Facebook