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	Fan diameter (mm)	Degree	Revolution (rpm)	Motor	Airflow (m ³ /h)	Pitot pressure (Pa)
2.8	280	30	1450	0.09-4	1464	48
3.15	315	30	1450	0.12-4	2072	59
3.55	355	30	1450	0.12-4	2977	74
4	400	30	1450	0.25-4	4263	95
4.5	450	30	1450	0.37-4	6070	121
5	500	30	1450	0.55-4	8327	149
			960	0.37-6	5566	64
5.6	560	30	1450	1.1-4	11682	186
			960	0.37-4	7724	81
6.3	630	30	1450	1.5-4	16639	236
			960	0.75-6	11016	104
7.1	710	25	1450	3.0-4	23815	300
			960	0.75-6	15766	141