An industrial squirrel cage blower fan is a forward-curved centrifugal blower built around a cylindrical, multi-bladed wheel — named for its resemblance to a rodent exercise wheel — housed in a heavy-duty steel scroll casing. Air enters axially through the open side of the wheel and is thrown radially outward by the curved blades, producing a high volume of steady airflow at low-to-medium static pressure, which the scroll housing channels toward a single discharge outlet — the same forward-curved wheel form used in a squirrel cage furnace blower, scaled up to industrial housings and motors.
Facilities engineers, HVAC contractors, and process equipment builders rely on industrial squirrel cage blowers wherever large volumes of air need to move efficiently and quietly through ducted or direct-mount systems — dust collection, drying and curing ovens, exhaust ventilation, combustion air supply, and general industrial air handling are common applications. Their forward-curved blade design allows direct-mount installation without extensive ductwork, external positioning of motor and bearings for easy maintenance access, and a compact footprint relative to the airflow volume they produce, distinguishing them from backward-curved or radial-blade blowers built for higher-pressure, lower-volume service.
Common configuration: airflow ranging from roughly 450 CFM on lightweight portable models up to 500,000+ CFM on the largest industrial units, static pressure from a few inches W.G. up to 52" W.G. on high-pressure product families, single-phase motors from 0.33 HP up to multi-HP three-phase motors on larger units, and heavy-gauge steel housings with either foot-mounted or flanged discharge configurations.
Quick-Reference Spec Glossary
- Airflow (CFM)
- Volumetric air delivery rate, ranging from hundreds to hundreds of thousands of CFM
- Static pressure (in. W.G.)
- Resistance the blower can overcome, from a few inches up to 50+ inches on high-pressure models
- Wheel design
- Forward-curved (squirrel cage) for high volume/low pressure; radial blade for higher pressure
- Motor HP
- Ranges from fractional HP on small units to multi-HP on industrial models
- Drive type
- Direct-drive (motor shaft-mounted) or belt-drive (pulley-coupled)
- Housing material
- Steel (standard) or cast aluminum (lightweight, corrosion-resistant)
- Discharge configuration
- Open discharge, flanged, or ducted outlet
- Mounting orientation
- Foot-mounted or direct-mount, position adjustable on some models