🔬 What is Blower Door Testing?
A blower door test is a diagnostic tool used to measure how airtight your home or building is. It helps identify unwanted air leakage that can drive up heating and cooling costs, reduce indoor comfort, and allow pollutants or moisture to enter.
🧰 How It Works
A blower door test uses a powerful fan mounted in a temporary frame placed in an exterior door. When turned on, the fan pulls air out of your home, lowering the indoor air pressure. This causes outside air to flow in through unsealed cracks, gaps, and penetrations. Technicians use this test to:
Measure air changes per hour (ACH)
Identify locations of air infiltration
Verify the effectiveness of air sealing work
Determine if the home meets local energy code requirements
🧱 Common Air Leak Locations
Around windows and doors
Plumbing and electrical penetrations
Attic hatches and recessed lighting
Baseboards and wall corners
HVAC duct joints and registers
