Pp air duct is a piping system for air transportation and distribution. According to the cross-sectional shape, the air duct can be divided into circular air duct, rectangular air duct, oblate air duct, etc. Among them, the circular air duct has small resistance but large height and is complicated to manufacture. So the application is mainly rectangular duct. PP ventilation pipe: strong ventilation capacity; Stable acid and alkali resistance, corrosion resistance and temperature resistance, preventing secondary chemical reaction between the medium in the pipe and the pipe body, and reducing the difficulty of purification treatment of industrial waste gas and liquid; The PP air duct can be directly connected with the flange, and the installation is simple, convenient and quick, which greatly improves the installation efficiency. PP plastic air duct is used to treat the exhaust gas of corrosive gas in factory buildings, which has good construction performance, light PP pipe, convenient installation and replacement, and low comprehensive engineering cost. Material: Polypropylene is a colorless, odorless, nontoxic and translucent solid substance. Pp (Polypropylene) is a kind of thermoplastic synthetic resin with excellent performance, and it is a colorless and translucent thermoplastic lightweight general plastic. It has chemical resistance, heat resistance, electrical insulation, high-strength mechanical properties and good high wear-resistant processing performance.