Metal-Casing Radial Fan

What is a metal-casing radial fan?

Metal (sheet steel) casing radial fans have a snail-shaped casing formed from bent and joined sheet steel; they draw air in from the center and discharge it under pressure through a peripheral outlet. Thanks to their robust construction and competitive price, they are used to supply combustion air in central heating boilers, to blow air in stoves, and to create airflow in drying and heating equipment. Their high-speed motors allow them to generate adequate pressure despite their compact size.

Applications

• Solid-fuel central heating boilers and stoves
• Drying and oven systems
• Air blowing in industrial equipment
• Air delivery in small duct systems

The model in this category, with the flow rate and speed values stated in the product name, is intended for compact boiler applications.

Selection and replacement

The flow rate and pressure of the new fan must meet the requirements of the equipment to be used. If a replacement is being made, the old fan's flange dimensions, mounting holes, outlet size, and motor voltage should be noted, and the new fan selected accordingly. The direction of rotation and the position of the outlet must be compatible with the air duct in the equipment. For fans to be used in hot environments, the motor's heat resistance must be taken into account.

Maintenance

In sheet-steel casing fans, the blades and interior of the casing should be cleaned regularly; accumulation of ash and soot reduces efficiency. Fans showing signs of rust on the casing should be protected and the source of moisture investigated. Bearing noise or vibration indicates that motor maintenance is required.

Frequently asked questions

Does a sheet-steel casing fan rust?

Rusting may occur over time in humid environments. Using the fan in a dry, well-ventilated location extends its service life.

What is the advantage of a high-speed fan?

It allows higher pressure to be generated with a smaller casing. In return, the noise level may be slightly higher.

Is the fan compatible with my boiler?

The flange dimensions, flow rate, and electrical specifications should be compared against the boiler manufacturer's recommendations.

Is there an aluminum alternative?

Yes; you can browse aluminum-casing radial fans.

What if the fan vibrates during operation?

There may be dirt on the blades or loose mounting hardware. Clean it and check the screws.

Can it be used with a thermostat?

Yes; a boiler thermostat or control panel can start and stop the fan as needed.

How is a sheet-steel casing fan maintained?

After isolating the power, the inlet and blades are cleaned with a brush and compressed air. Mounting screws and electrical connections should also be checked at this time.

Why has the fan's flow rate dropped?

Soot accumulated on the blades, a blocked inlet, or a restriction in the air path of the equipment reduces flow rate. Cleaning generally restores performance.