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Roof Top Centrifugal Supply Fan-YFRSC

● Wheel Specification: 300~1,000
● Installation: rooftop mounted
● Volume range: 600~450,00 m³/h
● Static pressure range: 0~700 Pa
● 4G Wind-surfer centrifugal wheel,high efficiency and non-overloading.
● Upward air intake to eradicate the incoming air mixing with rain water completely.
● High static pressure ready for ductwork, low RPM in same pressure to reduce the noise.
● Balance quality grade up to G2.5 (AMCA 204).
● Various transmission ways for flexible selection and allocation.
● Patented low streamline wind band,strong wind resistance,novel and practical.

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Roof Top Centrifugal Supply Fan-YFRSC

Effect of the 4G Wind-Surfer 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.


Excellent aerodynamic characteristics and sound characteristic
-- Compared with 4rd generation Wind-surfer wheel: Performance increased by 5-10% and noise reduced 2-3dB(A) in the same condition.
-- Compared with axial/mixed flow fans, sound reduced by 10~15dB(A).
-- Fan internal with well organized airflow and the pressure loss is small.
-- Wide performance range of high efficiency.

Reliability design: safe and long life
-- FEA aided design, distributed evenly of stress for making operation reliable.
-- Performance loss caused by working point change.
-- High static pressure:Low RPM in same pressure.
-- Blade falling resistant: Safe.
-- Non-overloading .

Appearance design:Strong wind resistance, Novel and practical
-- Low streamline wind band: reduces wind load.
-- Pitched wind band baffle: drains snow rapidly by gravity.
-- Suitable for strong winds.
-- Modernize buildings with enhanced taste.

Detail design: Humanization
-- Upward air intake:effectively prevented the incoming air mixing with rain water.
-- Roof curb cap: easy to assemble and water leakage is prevented.
-- Insect screen for intake.
-- INFI-KOAT Molecular FilmTM: long-lasting coating.

Advantages of direct drive: efficient, maintenance-free
-- Higher transmission efficiency .
-- No wearing parts, low maintenance.
-- Easier and more effective of maintenance.
-- Sealed self-lubricating bearing for motor, increasing service life.
-- Motor located the airflow: active cooling.

Advantages of belt drive: precise, adjustable
-- More precise selection up to the requirements of design conditions.
-- Easier maintenance and replacement of motor.
-- Independent bearings to bear the vibration, extending bearing life.
-- Design change: can be adjusted flexibly.


Naming Convention:


Roof Top Centrifugal Supply Fan-YFRSC

Tech Spec

YFRSC Technical Specification

Fan Type

The fan shall be the centrifugal fan which adopts backward inclined centrifugal wheel. The drive type shall be direct-drive or belt-drive. The fan shall use aluminum backward inclined centrifugal wheel, and shall include a wheel cone carefully matched to the inlet Venturi for precise running tolerances. 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. The manufacturer must own the production license for industrial products and ISO9001 quality system authentication.

Wind Band
The wind band shall be constructed of heavy gauge galvanized steel with [or: stainless steel] a rigid internal support structure. The wind band profile shall be of the streamline type; the structure shall be of the multi reinforced rib type to protect the fan from wind overload; and the external surface shall be pitched to quickly drain rain and snow by gravity.

Upward Air Intake
The fan inlet shall have upward air intake to make sure rain would not be sucked into the     fan body as well as the building

Motor shall be carefully matched to the fan load and its protection grade shall be IP54, while insulation class F and temperature rise B. The motor bearing shall be self-lubricating ball bearing. And TEFC, 2-SPD, EXP, VFD, 60Hz and other correct motor types must be selected according to the specific working conditions.

Transmission Device (Only for belt drive type)
Shaft: Fan shaft shall be heat treated through soaking furnace to reach the hardness level of HB250, 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. Motor pulleys shall be adjustable for final system balancing. Conical (QD) type bushing shall be equipped for easy removal of the pulleys. 
Bearing: Bearings shall be selected of metallic to avoid vibration directly applied to motor. The motor 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 heavy gauge steel and mounted on vibration isolators. The belt tension shall be adjusted through motor support plate to make sure the fan shaft and motor shaft always parallel. 

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 YFRSC models of INFINAIR.

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