Backward curved (backward inclined) fan wheels built to order: SWSI or DWDI, any diameter, width and bore, CW or CCW, in steel, stainless steel or aluminum. Matched to your old wheel, photos or drawing and dynamically balanced in our Long Island City, New York factory, as we have done since 1948. Call or Email for Quote.

Backward curved wheels and fans we build

• Belt Drive Utility SetsBackward curved utility sets, 10" to 49", up to 63,000 CFM.
• Duplicate a backward curved wheelNo part number? Send photos or the old wheel and we build an exact match.
• Repair and rebalancingRebalancing, new shafts and bearings, and rebuilds in our factory.

Backward curved vs forward curve

A forward curve wheel has many small cupped blades and moves a lot of air quietly at low pressure. A backward curved wheel has fewer, larger blades, turns faster and handles higher pressure more efficiently. Read the full guide to backward curved fans and forward curve vs backward inclined wheels.

What to send for a quote

• Outside diameter and blade width
• Single or double inlet
• Bore and keyway, and the hub location
• Rotation (how to tell)
• Material

Or just send photos of the wheel next to a tape measure, or ship us the old wheel.

Materials

• Steel: strong and economical for most HVAC and exhaust work.
• Stainless Steel: for kitchens, pools, moisture and corrosive air.
• Aluminum: light and rust free.

Questions

What is a backward curved fan wheel?

A centrifugal wheel whose blades lean back, away from the direction of rotation. It is also called a backward inclined wheel or backward curved impeller.

Why choose a backward curved wheel?

It is more efficient than a forward curve wheel at higher pressures, and its power draw levels off instead of climbing, so the motor is hard to overload.

Are backward curved and backward inclined the same?

Nearly. Backward inclined blades are flat and backward curved blades are curved, but both lean back from the direction of rotation and work the same way. The names are often used for each other.

Can you match my backward curved wheel?

Yes. We build backward curved wheels to order, single or double inlet, in steel, stainless steel or aluminum, matched to your old wheel, photos or drawing.