Airflow Range: 1,000～100,000 M³/h
Static Pressure Range: 300～2,000 Pa
Drive Configurations: Direct
Installation Methods: Rooftop
Applications: Laboratories/ Diluted Exhausts/ Polluted gases / Fume emissions
The mixed flow wheel includes a wheel cone carefully matched to the inlet cone for precise running tolerances to reduce air leakage and turbulence, improve efficiency and lower sound.
The design of the wheel is optimized through CFD flow field simulation and repeated tests for optimum air performance, dramatically improving the efficiency over the traditional mixed flow wheel.
The wheel has been dynamically balanced twice: after the continuous welding process and after epoxy coatings applied on the surface. The balance quality grade reaches AMCA 204-G2.5 standard well above the international standard of G6.3. This helps greatly improve wheel balance, reduce vibrations and lower sound.
The mixed flow wheel takes on intermediate performance characteristics between the axial and centrifugal wheel.
Die-formed and continuously welded, the wheel and flow passage components are of high precision, high strength and greater reliability.
With a unique discharge nozzle design, the YFLES High Plume Lab Exhaust Fan System can entrain the surrounding air and dilute the lab exhaust gas, thus reducing the concentration of pollutants discharged. More importantly, the addition of ambient air increases the mass flow rate and speed of the discharge windband, providing greater nozzle discharge force, which ultimately allows it to be diluted above the roof therefore the following are the main features:
The fan has designed according to AMCA design procedure, the products are produced within very control procedure following ISO 9001, ISO14001 and ISO 45001.
YFLES fan shall be direct or belt driven, inline type. The fan wheel shall be of the mixed flow type, constructed of steel, Wheels shall be statically and dynamically balanced up to AMCA 204-G2.5 standard.
The fan design should achieve maximum efficiency. The fan should have the characteristics of sudden pressure rise that extends to the operating range.The pressure shall continue to rise beyond the peak efficiency for stable and quiet fan operation. In the normal selection area, the horsepower shall reach its peak and be self-limiting.
High Plume Lab Exhaust Fan System YFLES shall be of the non-over loading design, and the size and volume capacity shown shall be consistent with the fan performance table.
The surface of the wheel shall be polished to remove any protuberances, welding spatters, burrs, sharp edges, scrap iron and greasy dirt before being finished with electrostatic epoxy coatings (Optional). The surface shall be a level one without sags, cracks, cockles or detachment. The surface shall remain free from corrosion.
| Fan Part | Description |
| Mixed Flow Impeller |
The wheel is of steel mixed flow type, which includes a tapered front disc, a hemispherical hub and a straight blades. The wheel shall be statically and dynamically balanced to G2.5 balance per AMCA 204 standard. When the wheel is running at the maximum allowable speed, it shall be able to maintain a smooth airflow and low noise. The wheel characteristics should be able to effectively avoid performance decline caused by slippage at the operating point.
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| Fan Housing
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Housing The fan shall have a cylindrical housing welded by steel plates. The air inlet should be streamlined. The housing should be properly supported and fixed to prevent vibration and pulsating airflow. The weather cover should wrap the motor and V-belt drive. The YFLES fan shall include an outlet nozzle, a wind band, a curb cap, a weather cover, and a sealed belt tube that prevents the belt and the drive from being affected by the airstream.
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| Motor |
The motor shall be carefully matched to the fan load. It shall be (IP55,IP56, …etc) rated with Class F,H Insulation according to project specification . The motor bearing shall be of ball type and lubrication- free. Out of the air stream shall the motor and drive mechanism be located to avoid grease or dirt accumulation.
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| Shaft |
The shaft shall be made of 40Cr steel and heat treated through homogenizing furnace to the hardness level of HB 286. The shaft material shall have a maximum limit of yield strength of 550MPa. Hard film shall be applied on the surface to avoid corrosion. The shaft shall also be dynamically balanced together with the wheel. The design speed of the shaft shall be at least 25% more than the maximum running speed of the fan. |
| Pulley |
Fan pulleys shall be sized for a minimum of 150% of the driving power. Pulleys shall be cast iron, keyed and securely attached to the wheel and motor shaft. Conical type bushings shall be equipped for easy removal of the pulley.
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| Belt |
The belt shall be grease and oil and static proof and resistant to high temperature
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| Bearing |
Independent metal bearings shall be used to support the shaft to avoid vibrations directly coming onto the motor. The bearing shall be selected with service life of (80, 000 to 200,000) hours at the maximum operating speed specified in the catalog as per the design. The bearing shall be of permanently sealed type and pillow block metal ball bearing that can be lubricated.
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| Drive Support |
Drive mechanism shall be supported by thick steel sheet finished with powder coatings to avoid corrosion. The belt tension can be adjusted through the adjusting bolt at the motor base. The design shall make sure the fan shaft and motor shaft is always parallel. |
| Belt Guard |
The fully-enclosed belt guard shall be fitted to avoid injuries
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| Curb cap |
It shall be of heavy-duty steel or galvanized type to ensure rainproof transition between the roof curb and the fan
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| Nozzle and windband |
With a nozzle and windband combined, the ambient airflow will be induced inside the housing and increase the discharge velocity to a recommended velocity of at least 15.24m/s with no significant Impact on BHP.
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| Weather cover |
The removable and rain-tight rain cover can offer complete protection of the motor and the exposed parts of the V belt driving unit.
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