HouseChalk
Flex duct
Flex duct is a flexible, insulated tube made of a wire coil covered with insulation and a vapor barrier, used to deliver conditioned air.
Why it matters
Flex duct is easy to install but loses airflow if it is kinked, compressed, or run in long stretches without support.
Where people get this wrong
Flex duct is not inferior to rigid duct if installed properly. Problems come from poor installation, not the product itself.
Real-world example
The HVAC installer runs flex duct from the trunk line to a bedroom register. It hangs in a smooth arc with no kinks or sags.
Where this hits your build
This term shows up during construction and affects decisions that are hard to reverse once the work moves forward. Understanding it now saves time, money, and frustration later.
Most people do not just struggle with terms. They struggle with the decisions tied to them.
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