The classification of ventilation fans

According to the way of  the installation, ventilation fans can be divided into: wall mounted, such as APB9-1A; FHC20A-11/21/31 etc., ceilings mounted the such as FHG12A-11; BPT16-33A and other window glass mounted such as APC9-1A; APC11-1A, etc.

According to the  functions, ventilation fans  are divided into: one-way transmission state (only one direction of air flow ventilation fans) such as FHC20A-21,Two-way (through the operation transform, which can exhaust the state work, but also into the ventilation fans of the gas state) by the structure, such as FHC20A-31, the filter function as a filter (for conveying air flow ventilation fans) such as AGB20,

According to the structure,  ventilation fans can be divided into open type unscreened (venetian blinds, baffles, etc.) pressure-type (open) rely on air pressure, such as FHC20A-11 the; FHC25B-11, etc.-linked (even rely on the switch mechanical movement with open) such FHC20A-21; FHC25B-31, etc.