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I wish someone could convince these idiots, as it is a huge waste of time, money, and material
Yes…but…Flex duct effectively creates a tight radius elbow where it turns into the top of a diffuser. The high pressure loss is further increased because the flex fabric gathers at the inside of the throat and reduces the effective diameter. But Thermaflex markets a simple cost effective device called a FlexFlow Elbow which mitigates this problem. http://www.flexflowelbow.com/ It works no matter which way the air flows.