Which type of duct is known to best handle thermal expansion and contraction?

Flex duct is designed to accommodate movements and adjustments within an HVAC system, making it an excellent choice for handling thermal expansion and contraction. The flexible nature of this duct type allows it to expand and contract without placing stress on the connections or the overall system. This adaptability is important because temperature changes can cause materials to expand or contract, potentially leading to issues like leaks or strain on joints.

Metal ducts, while durable, are rigid and do not have the same flexibility to absorb thermal movement. Similarly, spiral ducts are also rigid and typically used in applications where a sturdy, low-resistance airway is needed, but they are not as effective as flex duct in compensating for thermal expansion. Bare duct, depending on its material, can also be rigid and may not manage thermal changes as effectively as flex duct.

Overall, flex duct’s inherent design and materials enable it to best manage the challenges posed by thermal expansion and contraction in HVAC systems.