4-72, 4-79 and SS4-79 series centrifugal fans meet Grade A industrial standards in efficiency and noise performance, widely used for general ventilation in factories and civil buildings. They deliver clean, non-corrosive and non-flammable air with temperature ≤80℃ and dust content ≤150mg/m³.

SS4-79 dual-speed fans adopt multi-speed motors for adjustable air volume and pressure. Featuring simple structure and cost effectiveness, they realize dual-purpose operation and reduce operating costs.

Derived models: F4-72/79 anti-corrosion fans (FRP material) for corrosive gas; B4-72/79 explosion-proof fans with explosion-proof motors and optional iron/aluminum impellers; FB4-72/79 anti-corrosion & explosion-proof fans for complex corrosive and flammable working conditions.