What is a “Blower Door Test”?
A blower door is a device which measures the air tightness of buildings. It also measures airflow between building zones, and locates air leakage pathways. A duct blaster, similar to a blower door, tests the air tightness of duct work.
During the audit, the blower door is temporarily installed onto the frame of an exterior door—typically the main entrance. While the fan pushes air outside, the air pressure inside your home is lowered. This allows for the higher air pressure outside to flow through any cracks, gaps, and penetrations. The benefits of a blower door test are:
- Reduced energy usage by resolving air leakage
- Improved home comfort by reducing drafts
- Improved indoor air quality by ensuring air supply integrity
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