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Heavy duty Backward Curved DWDI Centrifugal Fan for AHU - Wheel Type L-YFBCDL

● Wheel Specification: 280~2,000
● Installation: floor-mounted
● Volume range: 1,112~499550 m³/h
● Static pressure range: 200~3,000 Pa
● Backward curved DWDI wheel-Type L,large volume and high efficiency. Balance quality grade up to G4.0 (AMCA 204).
● CFD flow optimization repeatedly,high-efficiency range and non-overload.
● Fully welded, high strength and leak-tightness.
● The driving mechanism could be installed on both ends of the shaft for equipment matching conveniently
● Air performance,sound and FEG certified by AMCA international.

Inquiry Online

Design of backward curved wheel

-- The fan adopts advanced technology. Design of backward curved centrifugal wheel is optimized by means of CFD hydro-field simulating. The design is more accordant with the aerodynamic characteristics, and has lower noise, and stable airflow.
-- Steel plasma cutting, precise positioning jig and all-welded manufacture.
-- Steel Jaser cutting, precise positioning jig and all-welded technique are adopted for the blade to ensure smoothness of the margin of the blade. The welding angle is accurate, the whole blade is with strong strength, and the stress is evenly distributed during long-time high-speed operation. The operation is stable and reliable.
-- Each wheel is subjected to dynamic balance test. We insist to the balancing level of G4.0 (Typical products are balanced to G6.3 only). Long-term quiet and stable running of the fan is ensured fundamentally.
-- Large volume and wide high-efficiency range.
-- Double air inlet structure is applied to the wheel, which ensures a large volume. In addition, the pneumatic performance of the wheel is smooth and flat, and has a wide high-efficiency range.


All-steel welded structure, ensuring better strength and safety
-- The FEA theoretical design structure is adopted for the main body of the fan. It is made through welding the steel plates, which ensures a stable structure and high strength of the fan, as well as better safety performance.
-- Continuous welded scroll, ensuring excellent air-tight performance
-- The scroll of the fan is made of steel by continuous welding, which ensures excellent strength of the scroll, and meanwhile prevents leakage of gas.

High reliability
-- Fan shaft is subjected to finish turning & hardening and tempering. Maximum load surpasses 35% of limit speed;
-- Bearing seal can be lubricated. Service life more than L10:80000 hours;
-- The fan is supported by stable channel steel base, so that stable running of the fan is ensured.

High Energy Efficiency Classification
-- The fan adopts backward curved wheel with high balancing level and high efficiency. In combination with housing designed by CFD flow field simulation and inlet Venturi pipe, fan Energy Efficiency Classification up to FEG80 (AMCA 205), and high-efficiency and energy-saving operating of the fan is ensured.

Convenient mating device
-- Design of the fan (A6 drive arrangements) ensures that the driving mechanism could be installed on both ends of the shaft. Driving mechanism of right-handed rotation or left-handed rotation could be adopted as the mating device according to actual needs.



Naming Convention:

Tech Spec

YFBCDL Technical Specification

Fan Type

The fan shall be double inlet with steel backward curved centrifugal wheel. The drive type shall be belt drive (A18) or no drive (A6).

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, air performance and FEG. And each fan shall be affixed with AMCA sound, air performance and FEG. Seal, The manufacturer must own the production license for industrial products and ISO9001 quality system authentication.

The wheel shall be steel backward-bladed centrifugal and shall be adopted as the wheel by all-welding. The wheel shall be statically and dynamically balanced to level G4.0 in accordance with AMCA204 standard. When the wheel is operating at the highest allowable speed, the volume shall be stable and the noise shall be low. Wheel features shall be able to avoid performance downgrade resulting from sliding of the working points. Structure of the fan shall allow convenient withdrawal of the wheel for maintenance and cleaning.

Fan Housing

Housing of the fan shall be made of steel. Its thickness and strength shall be able to bear the maximum operation weight of the fan. Housing of the fan shall be made through continuous welding. The housing of the fan must be equipped with a manhole for removing of foreign matters entering the fan.

Fan inlet shall be steel and aerodynamic design round curved section to smoothly transit the air to the wheel cone, it will have well commutate effect to effectively reduce turbulence, improve fan efficiency and reduce noise.

Fan surface shall be polished and cleaned up to remove particulates, welding slag, burrs, sharp edge, iron, oil, then epoxy coating [options: colour changes are available], fan surface shall be free of sags, wrinkle, blisters, exposed metal or peeling after coating. It shall be no corrosion and rust at least 10 years in allowable working condition.

Belt Drives
The fan shaft shall be treated through soaking furnace to the hardness of HB250 to 280. The maximum velocity shall be designed to at least exceed 35% of the maximum fan operation speed. Two bearings shall be used to support the fan shaft. The service life of the bearing shall be more than L10:80000h. At normal temperature, it shall be sealed and lubricated. The pulley shall be constructed of cast-iron, with a dimension selected corresponding to 130% of the driving power. The pulley and belt shall be provided with shield.


The motor shall be closely matched to the fan load, IP 54, and insulation class F, and the motor bearings shall be ball-bearings and could be lubricated. The motor and the driving mechanism shall be located out of the air flow to avoid accumulation of grease or dust from the air flow.


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 YFBCDL models of INFINAIR.


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