Square Inline Duct Fan

A square inline duct fan is specified where the duct system is square-section, not round. Commercial air supply and exhaust ducts are often square, and a round fan needs a reducer at each end, which adds leak points and takes up shaft space. This fan's casing section matches the standard square duct, and it is bolted in series with flange-to-flange connection, without a reducer. It is used for mid-section boosting and terminal exhaust in office, hotel and mall square duct systems, and in dust and waste-gas duct power sections.

Square casing section matches square duct, no reducer needed. Flange-to-flange bolting removes the reducers at each end, and with them the extra leak points and the shaft space they occupy.

Stiffened square casing. The casing is folded and welded from galvanised steel with reinforcing ribs welded at the four corners, so the casing is stiffer than a round one and does not deform under its own weight and air-stream load.

Backward-curved impeller, non-overloading. Motor power does not rise without limit as system resistance increases, so the motor does not overload where the actual resistance of a retrofit is uncertain.

Motor on the outside of the casing side plate. Oil vapour, dust and corrosive gas pass through the impeller and casing without touching the motor windings.

• Mid-section boosting in office air supply ducts where terminal volume is short
• Branch boosting before a hotel guest room exhaust riser
• Branch boosting in a mall toilet central exhaust system
• Power section of dust collection or waste-gas ducts in industrial service
• Square duct systems where a round fan would need reducers at both ends

Standard configuration:

Customised range (to be confirmed per project): flange dimensions to existing square duct; same-direction or turned discharge; anti-vibration hangers and flexible connectors; voltage to destination market.

For square duct systems, the casing and flange are made to the measured duct section so the fan drops into the existing run without a reducer, and the impeller is matched to the residual resistance of that run.

Customizable Items:
• Flange dimensions to existing square duct
• Discharge direction (same direction / turned)
• Anti-vibration hangers
• Flexible connectors
• Voltage to destination market

 Flange faces are protected with covers against deformation, and the impeller is fixed against rotation in transit. Packing is a wooden case, suitable for sea freight. The reinforcing ribs at the four corners are checked before the flanges are welded, because the casing stiffness is the point on which this fan differs from a round inline fan.

Hot Tags: square inline duct fan, China square inline duct fan manufacturers, suppliers, factory, centrifugal axial fan, centrifugal fan cfm, centrifugal flow fan, forward curved blower, in line centrifugal, scroll fan