RESNET HERS National Rater Test

When performing a duct leakage to outside test, what is the primary function of the blower door?

To pressurize the duct system to 50 Pa while the duct tester measures leakage. To create a neutral pressure plane between the house and the outdoors. To pressurize or depressurize the house to the same pressure as the duct system (typically 25 Pa). To measure the total building envelope leakage simultaneously with the duct leakage.

Correct Answer:

To pressurize or depressurize the house to the same pressure as the duct system (typically 25 Pa).

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