Blower door subtract

A technique involving conducting two whole house Blower Door air tightness tests with and without the supply and return registers and grills sealed off from the house. A subtraction of the sealed register test from the unsealed register test provides an estimate of duct leakage to the outside.
Unit of Measure: 
Commercial, Residential, Multifamily
Bedes version: 
Term ID: 0ae2da41-caf7-4f4d-bfc7-8c5644e86bc1