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Paramix Talk: Axial Fan Sizes

Axial Fan Sizes

By: Eddie Baki, 30.7.2012, 11:19

Axial flow fan size is normally the inner diameter of the casing or inlet diameter. This diameter, along with air velocity determines how much airflow the fan can supply.




Two common standards exist for fan sizes: metric (in mm) and inch.

Two common standards exist for fan sizes: metric (in mm) and inch.

Most common standard metric sizes are:
250
315
355
400
450
500
560
630
710
800
900
1120
1250
1400
1600
1800
2000
2250


Most common standard inch sizes are:
15
19
21
24
30
38
48
60
75

Bigger sized fans generally rotate slower than the smaller sizes. The centrifugal forces on the propeller blades would be otherwise very high.

Fan sizes are usually obtained via fan selection software applications. Should a customer however require a fan size smaller than that suggested by such applications a common method is to use two fans in tandem in order to obtain the required pressures at smaller fan sizes.

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