Backward Curved Centrifugal Fan – YFICK
  • Volume Capacity: 1,400~130,000 m³/h (824~76,471 CFM)
  • Static Pressure: 100~1,600 Pa (0.4~6.4 in.WG.)
  • Drive Type: Belt drive
  • Installation Methods: Base mount/ Ceiling hung/ Duct Mount
  • Applications: Low sound / Ducted ventilation of high static pressure/ Filtered ventilation


Forward Curved Centrifugal Fan Has Large Volume and Low Noise

— Compared with the backward inclined wheel, the forward curved wheel boasts larger volume at the same speed.

— Compared with the backward inclined wheel, the forward curved wheel runs at a lower speed and less noise under the same operating condition.

— Formed by spinning, the inlet bell has a perfect match with the wheel cone which leads to better airflow and less noise.

The Backward Inclined Centrifugal Fan Has High Efficiency and Non-overload

— Compared with the axial wheel, mixed flow wheel and forward curved wheel, the backward inclined wheel boasts higher efficiency.

— Fitted at the outlet, the baffle of V shape helps reduce turbulence and noise and increase efficiency.

— With its flat performance curves that can prevent non-overload, the backward inclined wheel can run more reliably.

Advanced Technology helps Ensure Accuracy

— Pittsburgh lock seams sealing techniques are used for the scroll and zero air leakage is ensured.

— Formed with great precision, side panels can expect to reduce errors of dimension in assembly.

— Formed by the punching method, blades are also positioned with dedicated fixtures for high precision.

Structural Design of Greater Reliability

— The forward curved wheel is supported by threaded rods for reliable operation in the long term.

— Stiffeners are used on the backward inclined wheel for safe operation in the long term.

— Firm channel steel frame supports the fan to ensure the stable operation.

High Balancing Level

— The wheel reaches G2.5 grade balancing level (whereas common products have only G6.3 level).

— It helps reduce vibration in operation and improves reliability.

— The sound is substantially down.


High Efficiency

— Airfoil blades that have optimum aerodynamic performance are used.
–The smooth vortex-shaped hub reduces turbulence.
–High-standard processes are used to reduce clearance between the impeller and the cylindrical fan body so that greater efficiency can be achieved.
–There are guide vanes fitted at the back of the impeller.

Great Reliability

— The advanced FEA-aided design is adopted for continuous optimization
— Core components use the casting process so that high strength can be ensured.
— By using the die-formed technology, high precision and great consistency are achieved.
— The higher balancing level helps create reliability in operation.

Direct Driven, Highly Efficient and Maintenance-free Design

— The transmission efficiency is much higher.
— There are no quick wear parts and low maintenance is required.
— Maintenance work is convenient and efficient.
— Long working life can be achieved by using the bearings that are sealed and require no lubrication.
— Less space is needed as the product size is smaller.


— General ventilation
— Explosion-proof ventilation
— Positive pressure air supply/ Smoke exhaust
— Two-speed ventilation

Easy and Different Installation Options

— Base-mount: horizontally or vertically.
— Ceiling-hung: horizontally or vertically.
— Roof mounted: Flag-CloudTM weather hood is used for outdoor installation.


INFINAIR IAS fans are CCCF certified.

Fan Type

The IAS fan shall be vane-axial type that has airfoil blades. It shall be of direct drive and the whole fan takes on a cylindrical shape.

Quality Standards

Tests shall be performed on IAS fans and certificates obtained under AMCA Standard 210 & 300. Each fan shall bear the AMCA Seal for Sound and Air Performance before leaving the factory. The manufacturer shall have the Production License for National Industrial Products and get the ISO 9001 certification.


The impeller shall undergo static and dynamic balancing tests and reach AMCA 204- G2.5 balancing level for greater stability and longer working life.

Fan Housing

It shall be constructed of cold rolled steel sheets and flanges formed through the integration process are used. The thickness of the housing materials shall ensure the housing supports the motor well without deformation.

Surface Treatment

The fan surface shall be treated so that no protuberances, welding spatters, burrs, sharp edges, scrap iron and greasy dirt can be found. The processes of oil removal, pickling, parkerizing and applying putty are done and then electrostatic epoxy coatings shall be applied. Also for the corrosion-free operation in the long term, the surface shall be a level one without sags, cracks, cockles or detachment.


The impeller shall be directly connected with the motor. The motor adopts B3 installation type. It shall have a degree of protection standard IP54, an insulation class F and Temperature Rise Class B. Its bearing shall be of ball type and require no lubrication.

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