RESNET HERS National Rater Test

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A HERS Rater is performing a blower door test on a 2,500 sq ft house with 8-foot ceilings. The final reading on the manometer is 1,800 CFM50. What is the approximate Air Changes per Hour at 50 Pascals (ACH50)?

4.82 ACH50 5.40 ACH50 6.00 ACH50 7.20 ACH50

Correct Answer:

5.40 ACH50

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