The roof extraction fans are mainly used for ventilation and air exchange inside buildings in industries like petroleum, chemicals, textiles, metallurgy, mechanical factory, experimental room, warehouse, etc. The fan can adapt to different structures of buildings which can be installed on roof or on wall. The fan consists of impeller, hair dryer, cap, motor and other accessories. The impeller can be both axial flow fan and centrifugal fan. The cap and base material is glass fiber reinforced plastic which is light, high strength, corrosion resistance and wind resistance.

Model	Revolution (r/min)	Power (W)	Airflow (m3/h)	Pitot pressure (Pa)
3.6	1450	1.1-4	1332-2634	393-347
4	1450	1.1-4	2006-5281	501-329
4.5	1450	1.1-4	2856-5281	634-416
5	1450	2.2-4	3864-7728	790-500
6	1450	4.0-4	6677-13353	1139-724
	960	1.5-6	4420-8841	498-317