SYQS — Single Inlet Backward Single-Plate Centrifugal Fan

Midi Industrial is a renowned Asian manufacturer of HVAC fans and building ventilation fans for engineering projects - engineered to fuse aerodynamics, motor technology and intelligent control.

A note on the SYQS
Pair a single inlet with a backward single-plate wheel and you get the SYQS: a belt-driven centrifugal fan for central air-conditioning duties that need more pressure than a forward-curved wheel can give, without the wide double-inlet cabinet. The range runs from 1,000 to 120,000 m3/h, pressures to 3,000 Pa, and wheel diameters 180 to 1400mm.

Backward wheel for higher pressure
The flat backward-inclined plate blade is chosen when filters, heating and cooling coils and long branches add static resistance. It keeps the fan working near its efficient duty instead of pushing a forward wheel beyond its comfortable pressure zone. Single-side entry narrows the fan for section mounting, useful in modular AHUs and air-side equipment where two inlets would not fit. Belt drive provides adjustable speed through the pulley ratio; the motor sits outside the air path on its own mounting, so servicing belts and tension does not mean reaching into the wheel compartment. Routine maintenance covers belt condition and tension; worn belts are swapped as part of the service cycle. Midi Industrial supplies this series for central air-conditioning systems on projects where pressure and a compact inlet arrangement both matter.

Typical fits
Air handling units, central stations and ventilation systems in commercial buildings, workshops and public facilities, especially where ductwork runs long or the component stack on the airstream creates higher resistance. Send the design airflow and external static pressure before selecting the wheel size.

Impeller Diameter: 180-1400mm
Air Volume: 1000-120000 m³/h
Pressure: 0-3000 Pa
Drive Type: Belt drive

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