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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 affects daily comfort in every room. Problems often show up after move-in when certain rooms run hot, cold, or noisy.
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