Basic parameter for domestic fan selection

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General recommendations for mounting

To reduce air pressure losses associated with air turbulence provide a straight air duct at the fan inlet and outlet. The minimum straight segment length must be at least 1 air duct diameter at inlet and 3 air duct diameters at outlet. No filters or other similar equipment is allowed inside the air ducts.


For rectangular ducts the respective air duct diameter is calculated as follows:

D = air duct diameter
= air duct height
= air duct width