Both are "cooling fans", but they solve different problems. The fastest way to the right choice is to understand one distinction: axial fans move volume, centrifugal blowers beat resistance.
How each one moves air
An axial fan pulls air straight through along its axis — like a household desk fan. It excels when air can flow freely in and out of the enclosure: large openings, short paths, little obstruction. Its datasheet shows high maximum airflow (CFM) but the flow collapses quickly when the system impedance rises.
A centrifugal blower draws air in through the side (around the hub) and throws it out at 90° through a narrow outlet. That geometry trades raw volume for static pressure — the ability to keep air moving through dense heatsinks, filters, long ducts and narrow slots. Size for size, a blower delivers far less free-air flow than an axial fan, but holds that flow under back-pressure that would choke an axial fan.
The decision questions
- Is the air path open and short? → axial fan. Cabinet ventilation, panel cooling, open power supplies.
- Does air squeeze through a heatsink, filter or thin slot? → blower. Projectors, air purifiers, 1U/2U rack devices, slim set-top boxes.
- Do you need to duct the air or aim it? → blower. Its tangential outlet naturally feeds a duct or nozzle.
- Is installation depth critical? → blower. A 40×40×10 mm blower can outperform a much thicker axial fan in a restricted cavity.
| Characteristic | DC Axial Fan | DC Centrifugal Blower |
|---|---|---|
| Flow direction | Straight through the axis | In from the side, out at 90° |
| Free-air airflow | High | Low to medium |
| Static pressure | Low to medium | High |
| Best impedance | Open, low-resistance paths | Dense fins, filters, ducts |
| Typical thickness | 10–38 mm | 7–33 mm |
| Typical applications | Cabinets, power supplies, LED, EV chargers | Projectors, purifiers, slim electronics, servers |
A real example
A customer cooling an outdoor energy-storage cabinet first specified a 120 mm axial fan — good free-air numbers on paper. But the cabinet's intake louvers and dust filter added so much resistance that the fan's real delivered airflow was under half the datasheet value. Switching to two of our 97 mm high-static-pressure blowers, fed through a short plenum, restored the designed airflow at similar noise and power. Same "CFM on paper", completely different result in the box.
Always evaluate the fan against your enclosure's impedance curve, not its free-air rating. If you can share the enclosure drawing, we will simulate the operating point on our wind tunnel data before you commit to tooling.
Our line covers both families: axial fans from 20 mm to 170 mm and centrifugal blowers from 40 mm to 120 mm, in 5/12/24/48 V with PWM, tacho and IP waterproof options — so the choice stays an engineering decision, not a catalog limitation.
Not sure which type fits?
Send your enclosure drawing or a photo of the air path — our engineers will recommend the right fan type and size.