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Non-metallic air ducts are made of synthetic materials: polyethylene, fiberglass, etc.

Polyethylene air ducts: are usually used in supply ventilation systems. When the fan is turned on, the duct (in the form of a sleeve) is inflated with air.

Fiberglass ducts: usually used to connect the fan and air distributors. They are stretched on a metal frame.

Vinyl plastic air ducts: used when moving air containing acid vapors, etc., causing corrosion of steel. The thickness of the vinyl plastic is 3–9 mm, connected by welding.

Non-metallic air ducts are resistant to corrosion, they can be bent in any plane and at any angle.