Centrifugal Blower

Blower 4020

Name: Blower 4020 Centrifugal Blower
Brand: Ruifengda

The Blower 4020 uses a forward-curved centrifugal impeller in a 40 × 40 × 20 mm scroll housing to deliver high static pressure through filters, ducts and dense heatsinks — the right choice where a same-size axial fan would stall.

Frame Size40 × 40 × 20 mm

Voltage12 V DC

Max Airflow≈ 18 CFM

BearingSleeve / One-ball / Dual-ball

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Product Overview

Where airflow must be forced through resistance, the Blower 4020 delivers: a 40 × 40 × 20 mm centrifugal blower producing high static pressure from a compact single- or double-inlet scroll.

Each Blower 4020 is bench-tested after a complete aging cycle at our Shenzhen facility, and test records are retained by serial batch. Tell us your voltage, duty point and environment and the confirmed curve for your order will match the sample you approved.

Key Features

High static pressure output for filters, ducts and dense fin stacks
Forward-curved centrifugal impeller in UL94 V-0 plastic
Compact scroll housing with single or double inlet options
Ball-bearing versions for long life in any orientation
PWM speed control available on DC series
30 mm to 200 mm housing sizes to match your duct diameter

Note: Specification values are representative; measured performance depends on system resistance and ambient temperature. Ask for the measured P-Q curve with your sample.

Typical Applications

Laser & projector cooling Server / 1U-2U chassis Air purifiers & range hoods Heaters & heat pumps Ducted ventilation Power electronics with dense heatsinks

Full Specifications

Frame Size	40 × 40 × 20 mm
Rated Voltage	12 V DC (5 V / 24 V optional)
Rated Current	0.45 A (at rated voltage, max speed)
Speed	7,000 rpm (typical; PWM control 0–100 %)
Airflow	18 CFM / 31 m³/h (typical, free air)
Static Pressure	118 Pa / 12.0 mmH₂O (typical, max)
Noise	36 dBA at 1 m (max speed)
Speed Signal	Tach (FG) optional; PWM control optional
Bearing Type	Sleeve / One-ball / Dual-ball
Expected Life	35,000 h at 25 °C, 65 % RH (L10)
Operating Temp.	−10 °C to +70 °C (standard); −40 °C to +85 °C optional
Insulation Resistance	≥ 100 MΩ at 500 VDC
Dielectric Strength	500 VAC / 1 min (AC series: 1,500 VAC)
Frame & Impeller	UL94 V-0 PBT + fibreglass
Certification	CE / RoHS (UL on request)

Frequently Asked Questions — Blower 4020

When should I choose the Blower 4020 blower instead of an axial fan?

Choose Blower 4020 when the enclosure has high airflow resistance — dense heat sinks, filters or long ducts. A centrifugal blower keeps steady pressure at restrictive duty points where an axial fan of the same size would stall.

Which way does Blower 4020 discharge air?

Blower 4020 is a forward-curved centrifugal blower: air enters axially and discharges radially through the scroll outlet, so plan the duct or vent direction accordingly. Outlet orientation can be customized.

Can Blower 4020 run at 24 V instead of 12 V?

Yes, Blower 4020 is offered in 5 V / 12 V / 24 V DC windings with matching speed and current. The same frame can be tuned for your supply rail at no tooling cost.

How noisy is Blower 4020 in real equipment?

Rated noise is measured at 1 m in free air. Inside a ducted enclosure, expect 3–6 dBA more; a PWM curve or rubber mounting pads usually reduces perceived noise noticeably.