Ductwork primarily refers to the ventilation pipes of the air conditioning system, which is often overlooked but is an essential component of the AC system. It encompasses a variety of pipes made from thin steel plates, aluminum plates, rigid PVC boards, fiberglass, and other composite materials, used for conveying air and air mixtures.

1. Materials can be categorized as:

Metallic ductwork, non-metallic ductwork. Among them:

(1) Metal ducts can be further categorized into:

Sheet metal air ducts, aluminum air ducts, stainless steel air ducts, etc.

(2) Non-metallic ductwork can be categorized into:

High-density polyvinyl chloride (PVC) ducts, acrylic glass ducts, inorganic glass ducts, fiberglass ducts, and other composite material ducts.

2. According to the shape of the duct, they can be categorized as:

Circular ducts, rectangular ducts.

3. Ventilation and air conditioning systems can be categorized based on their working pressure.

High-pressure air ducts, medium-pressure air ducts, and low-pressure air ducts