Fan Inlet Rings

Fan inlet rings are devices used to maximise the performance of fans, such as backward curved centrifugal fans, by guiding air into the impeller blade (the rotating part of a fan) inlet. Using a fan at peak efficiency minimises noise emitted and power consumption from the fan whilst delivering optimal performance.

What are fan inlet rings used for?

Fan inlet rings ensure smooth laminar flow (flow in parallel layers, with no disruption between the layers) of air as it enters the impeller.

How do fan inlet rings work?

Fan inlet rings are usually positioned with the ring surrounding the inlet, and slightly overlapping into the interior. This helps to reduce noise induced by turbulence, eliminate flow disturbances before air is let into the fan and keep power consumption to a minimum for maximum efficiency.

Fan inlet rings also serve the critical purpose of blocking exhaust air from re-entering the air intake. Due to the frequent exposure to atmospheric moisture, fan inlet rings are usually made of materials that don’t rust.


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Description Price For Use With Inner Diameter Outer Diameter Depth
RS Stock No. 826-0711
Mfr. Part No.51357-2-4013
Brandebm-papst
HK$325.24
Each
units
Backward Curved Centrifugal Fan 325mm 330/355mm -
RS Stock No. 175-7145
Mfr. Part No.U97XX-500A9
BrandMicronel
HK$181.84
Each
units
U97EM series fans 34mm 37mm -
New
RS Stock No. 191-9263
Mfr. Part No.109-1081
HK$41.41
Each
units
Centrifugal Fan 134mm 139mm 21mm
RS Stock No. 826-0966
Mfr. Part No.96358-2-4013
Brandebm-papst
HK$171.93
Each
units
Backward Curved Centrifugal Fan, Ebm-papst Impeller 225 146mm 223mm 28mm
RS Stock No. 175-7151
Mfr. Part No.U97XX-009C3
BrandMicronel
HK$177.93
Each
units
U97EM series fans 34mm 37mm -
RS Stock No. 825-6416
Mfr. Part No.40075-2-4013
Brandebm-papst
HK$879.34
Each
units
Airflow Measurement - 400mm -
RS Stock No. 826-0960
Mfr. Part No.96359-2-4013
Brandebm-papst
HK$267.41
Each
units
Backward Curved Centrifugal Fan, Ebm-papst Impeller 250 164.5mm 255mm 31mm
New
RS Stock No. 191-9262
Mfr. Part No.109-1080
HK$38.90
Each
units
Centrifugal Fan 123mm 128mm 5mm
RS Stock No. 826-0957
Mfr. Part No.9588-2-4013
Brandebm-papst
HK$108.92
Each
units
Ebm-papst Impeller 160, Forward Curved Centrifugal Fan 130mm 185mm 17mm
RS Stock No. 860-0260
Mfr. Part No.31050-2-4013
Brandebm-papst
HK$348.326
Each (In a Pack of 5)
units
Ebm-papst R4D310-AR 208.1mm 300mm 48mm
RS Stock No. 826-0948
Mfr. Part No.9576-2-4013
Brandebm-papst
HK$121.61
Each
units
Backward Curved Centrifugal Fan, Ebm-papst Impeller 175/190 125.5mm 170mm 14mm
RS Stock No. 825-6365
Mfr. Part No.31051-2-4013
Brandebm-papst
HK$240.62
Each
units
Backward Curved Centrifugal Fan 280mm 310mm -
RS Stock No. 826-0720
Mfr. Part No.54478-2-4013
Brandebm-papst
HK$511.28
Each
units
Backward Curved Centrifugal Fan 390mm 450mm -
RS Stock No. 826-0950
Mfr. Part No.9597-2-4013
Brandebm-papst
HK$167.37
Each
units
Ebm-papst Impeller 180, Forward Curved Centrifugal Fan 149mm 210mm 28mm
RS Stock No. 826-0979
Mfr. Part No.96360-2-4013
Brandebm-papst
HK$365.47
Each
units
Backward Curved Centrifugal Fan, Ebm-papst Impeller 270/280 182.5mm 280mm 35mm
RS Stock No. 826-0954
Mfr. Part No.9609-2-4013
Brandebm-papst
HK$209.56
Each
units
Backward Curved Centrifugal Fan, Ebm-papst Impeller 220 155mm 252mm 21mm
RS Stock No. 826-0963
Mfr. Part No.9621-2-4013
Brandebm-papst
HK$302.47
Each
units
Ebm-papst Motorized Impeller 310 193mm 300mm 43mm
RS Stock No. 826-0944
Mfr. Part No.9566-2-4013
Brandebm-papst
HK$75.36
Each
units
Backward Curved Centrifugal Fan, Ebm-papst Impeller 133 87mm 129mm 13mm
New
RS Stock No. 191-9264
Mfr. Part No.109-1135
HK$107.08
Each
units
Centrifugal Fan 155mm 252mm 7mm
New
RS Stock No. 191-9261
Mfr. Part No.109-1073
HK$53.54
Each
units
Centrifugal Fan 165mm 170mm 14mm
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