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Inline Square Centrifugal Fan-ISQ

● Wheel Specification: 300~1,000
● Installation: hanging, floor-mounted
● Volume range: 600~490,00 m³/h
● Static pressure range: 100~1,600 Pa
● 4G Wind-surfer centrifugal wheel,high efficiency,low noise and non-overloading.
● The scroll is saved and the cabinet size is reduced.
● Balance quality grade up to G2.5 (AMCA 204).
● Square casing with multi-discharge, easier to connect.
● Various transmission ways for flexible selection and allocation.
● Sound and air performance certified by AMCA international.

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Effect of the 4rd generation Wind-SurferTM wheel series
-- Excellent aerodynamic characteristics and noise characteristics.
-- High-efficient area width without overloading.
--Balance quality grade up to G2.5(Typical products are balanced to G6.3 only).

Air performance design
-- Optimized design of CFD flow field simulation,repeatedly validated.
-- Front disc and inlet venture tube according with folw field characteristic.
-- Flow passage control:matched each other to restrain the air flow better.
-- Optimize the blade angles.

Structure performance design
-- Stress analysis of FEA to improve performance.
-- Selected the strengthen structure according to different specifications to improve reliability.
-- Using riveting technology to avoid stress.

Improved wheel
-- Continues improvement:The wheel has the 4rd generation.
-- Compared with the 2rd generation:Performance increased by 5-10% in the same parameters.
-- Compared with the 2rd generation: Noise reduced 2-3 dB(A)in the same parameters.

Advanced process
-- Inlet venture tube & Front disc:spun process to ensure streamlines aerodynamic characteristics.
-- Inlet venture tube: replace bell mouth to ensure smooth air flow.
-- Blades:once punch forming to ensure process quality.
-- Tooling:dedicated fixture to ensure precise install of the blades.


Wide performance range and more economic
-- 4rd Generation Wind-surfer Centrifugal Wheel: low noise while pressurizing compare with 2nd generation.
-- Maximum wheel diameter is 1 meter,reduce fan quantity and primary investment.
-- The scroll is saved and the cabinet size is reduced.

Centrifugal in-line:obvious advantage in RPM and noise
-- Compare with axial/mixed flow fans rotation speed is reduced 20-30%.
-- The sound pressure level range reduced by 10-15 dB(A).
-- Fundamental way to reduce noise.

Plug fan structure
-- Plug fan directly suck air into wheel and pressurize:air flow pattern improved.
-- Direct drive no dust generated:suitable for clean rooms of wafer fab,pharmaceutical and food industry.
-- AMCA Seal:sound and air performance certified.
-- The sound & air performance is approved by AMCA.

Sound & Air Performance Seal is applied to each fan
-- Square casing with multi-discharge,easier to connect.
-- Square inlet/outlet sleeve flange as standard accessories :round/square convention duct is not needed.
-- Duct connection cost reduced ,and jobsite working time saved.
-- Motor can be multi-position.
-- Multi-discharge:More convenient and flexible for design & construction.


Naming Convention:


  • ISQ
  • ISQ-D
Inline Square Centrifugal Fan-ISQ
Inline Square Centrifugal Fan-ISQ-D


Inline Square Centrifugal Fan-ISQ

Inline Square Centrifugal Fan-ISQ

Inline Square Centrifugal Fan-ISQ

Tech Spec

ISQ Technical Specification

Fan Type
The fan shall be belt drive or direct drive in-line centrifugal type, with aluminum backward inclined centrifugal wheel. The inlet Venturi shall have round curved section to smoothly transit the air to the wheel cone. The wheel shall be statically and dynamically balanced to Level G2.5 as per AMCA204 standard. 

Quality Standards 

The fan shall be tested in accordance with AMCA Standard 210 and 300 and AMCA licensed according to AMCA Publication 211 and 311 for sound and air performance.  And each fan shall be affixed with AMCA sound and air performance seal. The manufacturer must own the production license for industrial products and ISO9001 quality system authentication.

Fan Housing

Fan housing shall be constructed of heavy gauge galvanized steel (option: epoxy powder coated) with a rigid internal support structure. The thickness of the panel shall be adequate to support the weight of drive and motor. The housing shall have optional discharge direction.

Transmission Device (Only for belt drive type)

Shaft: Fan shaft shall be heat treated through soaking furnace to the hardness level of HB370, and the surface shall be hard film corrosion treated. The fan shaft shall be balanced together with the wheel, and the shaft design speed shall at least exceed 25% of the maximum fan operation speed.   
Pulleys: Fan pulleys shall be sized for a minimum of 150% of driven power. Pulleys shall be cast iron, keyed and securely attached to the wheel and motor shaft. Motor pulleys shall be adjustable for final system balancing. Conical (QD) type bushings shall be equipped for easy removal of the pulleys.  
Bearing: Two bearings shall be used to support fan shaft to avoid wheel vibration directly applied to motor. The bearings shall be selected for a minimum (L-10) life in excess of 80,000 hours at maximum cataloged operating speed. Bearing type shall be permanently sealed, lubricable pillow block metal ball bearings.   
Drive support: Drives shall be supported by powder coated (corrosion resistant) heavy gauge steel. The belt tension shall be adjusted through motor support plate, the design shall make sure the fan shaft and motor shaft always parallel. 


Motor shall be precisely matched to the fan load, IP54, and insulation class F. Motor and drives shall be out of the air stream to avoid grease or dirt accumulation.   

Explosion-proof Structure (Only for explosion-proof type)

Fan shall conform to Spark B explosion-proof structure according to AMCA99 Standard. The wheel and the inlet shall be constructed of aluminum and the motor shall adopt explosion-proof type. The whole fan should own CNEX certification and the manufacturer must own the production license for anti-explosion electric products.

Fire fighting Certification (Only for smoke removal duty)

The fan shall be tested OK in complying with the General Usage Centrifugal Fan technical Specification (China National Standard JB/T 10563-2006). A test report issued by licensed authorities shall be provided. The fan must be tested according to China National Standard GA 211-2009. Fire Fighting Smoke Removal Fan High Temperature Testing Method, running continuously over 30 minutes when the main duct air temperature is 280 degrees centigrade. The high temperature resistance character must be qualified by presenting an official certificate.


Permanently fixed aluminum nameplate shall be fixed on fan body clearly display fan mark, product model and serial number (i.e.: unique ID for each fan), so that the customer can use this number to find out the parts used. 

Acceptable Manufacturers

Qualified suppliers shall have an AAA credit rating. Providing INFINAIR or similar products, with their design based on ISQ models of INFINAIR.


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