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Will New Windows Have Air Leakage?

Friday, February 17th, 2017 by Ray Craig


Will New Windows Have Air Leakage?

Any operable window or door, even new ones, will have some degree of air-filtration. All windows are tested under the influence of a 25 MPH wind under which the air infiltration rate must be less than 0.30 cubic feet of air per minute per square foot of window area. Therefore, a 3 foot by 4 foot window can have a total air infiltration of 3.6 CFM. At a 50 MPH wind, the wind pressure is four times greater than it is at 25 MPH. As a result, considerably more leakage will occur at higher wind speeds.

Most new windows will have an air infiltration rate below the 0.30 maximum. However, a number of factors such as window size, location, building design and terrain, just to name a few will affect a windows air infiltration performance.

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