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Figure 2. A side-by-side comparison shows how there can be varying hole sizes and amounts of air leakage when getting the same zonal pressure reading. Here a 10 in2 hole and 40 square inches of venting yields the same exact zonal pressure reading as a 100 in2 hole and 400 square inches of venting. (CHP Energy Solutions)

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Uploaded on May 30, 2019