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In this article, researchers studied the effects of bypass air on filter performance. Their findings suggest that most HVAC filters with sizeable bypass gaps actually perform worse with age, which goes against conventional knowledge. Additionally, they found that high-efficiency filters may not justify their expense if they have sizable gaps. The takeaway here is that any analysis done to try to optimize the cost-effectiveness of filtration must take into account the cost for minimizing bypass or account for reduced efficiency caused by bypass.
For more information on the effects of gaps and bypass on filter performance, contact Arthur Dwight, Carolina IAQ’s principal and engineering director.
Read the full text of the research article here.