Direct Drive Centrifugal Fans
Our most popular design, we call it No.4.
Centrigual Fans
Our most popular design
The impeller is directly mounted to the motor, which is outside of the airstream. Maximum temperatures are 200°C and 300°C with integral lagging.
The increasing use of inverters in conjunction with fans has become the modern “norm” for fan design, with energy savings being made by slowing down your already energy-efficient RHF Smoothflow fan. (Please be aware that if you want a speed-up capacity in a fan – tell us at the quotation stage so we can allow for fan law implications on material construction and power requirement)
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No.4 Pedestal
(motor directly onto the impeller)
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No.4 V
(as above but designed to be fitted on the inlet flange with the motor mounted vertically (typically used on dust collectors)
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No.4 Plug
(as above but designed for air circulation within a plenum with or without casing & mounted on top, at the side or underneath.
Leading Manufacturers
Technical details
- Size Range Universal
- 250mm to 900mm (with and without drive side removable impeller)
- Size Range Fixed Handing
- 1000mm to 2000mm (2450mm as special)
- Max temperature
- 200°C standard (With lagging or "bung" up to 300°C)
- Arrangements
- (No.4 V - Inlet Mounted, No.4 Pedestal - "Floor Mounted", No.4 Plug (up to 350°C as standard)
Energy Efficient
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Smoothflow is our commitment to producing the most efficient centrifugal fans you can buy.
Our unique Smoothflow inlets and impellers are up to 15% more efficient than our competitors by running with less turbulence, noise, and absorbed power. See how Smoothflow can help you save money with a brand-new Energy Calculator!