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Material: aluminum alloy, stainless steel, galvanized plate., Diameter, height, axle holes depond on client requirements - details see: https://www.machineto.com/backward-curve-centrifugal-fan-impeller-10248255

Specifications	Diameter(mm)	Height(mm)	Axle hole(mm)	Blade number
200	202	88	25	38
225	228	98	25	42
250	254	109	25	38
280	284	123	30	42
315	318	137	30	38
355	358	154	35	42
400	404	174	35	38
450	454	195	40	42
500	504	217.2	40	38
560	564	243.2	50	42
630	634	273.2	50	38
710	714	309	50	42
800	804	347	55	38
900	906	389	60	42
1000	1006	432.7	60	48
1120	1126	483.7	75	48
1250	1256	541.5	80	54