BN-D Series Backward-curved Centrifugal Fan DC133/175/190/225/250mm

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Product Description

Model	Voltage [V]	Max Current [A]	Speed [rpm]	Max Power [W]	Max Airflow [m³/h]	Noise [dB(A)]
B133P.D001	24	1.5	4000	36	450	62.6
B175P.D004	48	1.83	4000	88	685	73
B175P.D006	24	1.83	3100	44	535	69
B190P.D003	48	1.52	3150	73	610	72
B220P.D001	48	2.92	3150	140	1040	73.5
B225P.D004	48	2.71	2820	130	1220	67.7
B225P.D005	48	9.10	4000	437	1738	74.8
B225P.D008	48	2.70	2810	130	1221	67.7
B250P.D001	48	2.92	2810	140	1515	72

DIMENSION

Model	A	B	C	D	E	F	G	H	I
B133P.D001	Ø133	Ø72	Ø93.3	90	60.5	2	12.8	Ø118	Ø129
B175P.D004 B175P.D006	Ø175	Ø72	Ø132	69	63	2	14	Ø158	Ø170
B190P.D003	Ø194	Ø72	Ø133	69	62.7	2	14	Ø158	Ø170
B220P.D001	Ø224	Ø92	Ø159	71	64.8	3	20	Ø245	Ø253
B225P.D004	Ø225.2	Ø92	Ø154	99	89.5	3	28	Ø210	Ø224.5
B225P.D005	Ø225.2	Ø92	Ø154	99	89.5	3	28	Ø210	Ø224.5
B225P.D008	Ø225.2	Ø92	Ø154	99	89.5	3	28	Ø210	Ø224.5
B250P.D001	Ø251	Ø92	Ø172.5	100	85.4	3	31	Ø240	Ø255

Airflow-static pressure curve (P-Q)

Airflow-power curve (N-Q)

Core Selling Points

This series consists of brushless DC backward-curved centrifugal fans, covering mainstream sizes from 133mm to 250mm. Powered by safe low-voltage DC 24V/48V, they feature large air volume, high efficiency, low power consumption, quiet and stable operation, and easy speed control. They are specially designed for low-voltage DC-powered applications such as energy storage systems, communications equipment, cabinets, fresh air units and precision devices.

1.High-efficiency DC design, large air volume & high static pressure

With professional backward-curved blades, it delivers high aerodynamic efficiency, low airflow resistance and no power overload for safer operation. Air volume ranges from 450–1738m³/h with ample static pressure and long air supply distance, meeting high-density heat dissipation and strong ventilation requirements.

2.Safe low voltage, wide DC compatibility

Supports standard DC voltages of 24V/48V, ensuring safety with no electric shock risk. Compatible with DC power supply systems including batteries, power modules, photovoltaic systems and communication base stations, ready for plug-and-play installation.

3.Energy-saving & low consumption, low operating cost

Brushless DC motors offer higher energy efficiency and lower power consumption at the same air volume. Power ranges from 36–437W, providing high efficiency even at light load and greater power savings for long-term operation.

4.Quiet & stable, eco-friendly performance

Optimized air duct and dynamic balance design reduce noise to as low as 62.6dB(A) with minimal vibration during operation. Ideal for equipment rooms, indoor spaces, precision devices and other noise-sensitive environments.

5.Complete specifications, standardized installation

Covers full sizes: 133/175/190/220/225/250mm, with unified mounting holes and interfaces. Compact structure enables easy replacement and simple equipment integration.

6.Stable & reliable, long service life

Brushless motors eliminate brush wear, with stable speed (2810–4000rpm) and support for 7×24 hours continuous operation. Long lifespan and low maintenance make them suitable for harsh industrial working conditions.