Proventofan's DC centrifugal fan and DC centrifugal blower range uses a backward-curved impeller for higher efficiency and a non-overloading power curve. Built for equipment that already runs on a 24V, 48V, 85V or 110V DC bus.
Eleven frame sizes from 133mm to 450mm. Impeller available in plastic or aluminum alloy. Voltage options: 24V, 48V, 85V and 110V DC. Higher-static-pressure builds are also supplied as DC centrifugal blowers. The 250mm model is the most common request.
Speed control: PWM, 0–10V analogue, or Modbus RS-485. Voltage, impeller material, PWM curve, housing finish and private label are all available on request. Typical uses span equipment cooling, ventilation and filtration.
If your system already runs on a DC bus and the speed needs to vary with load, a DC centrifugal fan connects straight in. These are the five applications we ship into most often. These applications are mainly equipment-level cooling. As a centrifugal cooling fan, it moves air right at the point where the equipment itself generates heat, rather than cooling the room around it.
Server Rooms & Data Centers
A 48V model connects directly to server, PDU or rack-level DC power without an added AC-to-DC conversion stage. This removes a failure point and avoids the idle losses that stage adds.
PWM or 0–10V control lets fan speed follow your equipment's own thermal or load signal instead of running at one fixed speed. Confirm your specific control interface and signal compatibility before design-in.
This is component-level cooling: fans mounted inside server chassis, PDUs and rack-level equipment that already runs on 48V DC. For room-level cooling tied into building BMS/Modbus (CRAC units, UPS room ventilation), see our EC centrifugal fan range
Medical & Laboratory Equipment
Laminar flow cabinets, analyzers and ventilators push air through filters and internal baffles, so the fan works against real back pressure.
Compared with many similarly sized axial designs, a centrifugal fan generally holds more of its rated flow under that resistance. Select from the required operating point on the curve, not the peak datasheet value alone.
This fits benchtop and equipment-level medical/lab devices running on their own DC supply, such as analyzers, portable diagnostic equipment and ventilators. For facility-level cleanroom HVAC integrated with building BMS (HEPA/ULPA filtration, fan filter units), see our EC centrifugal fan range
Telecommunications Cabinet Cooling
In a sealed telecom cabinet, air goes in one side, through the equipment and out the other, and resistance builds up fast.
Compared with many similarly sized axial designs, a centrifugal fan can hold more usable airflow as that resistance rises. Select from the fan curve at your enclosure's actual operating point, not the maximum free-air number on a datasheet.
For unmanned outdoor base station cabinets, getting that airflow right at commissioning means you don't go back in three years to find out it wasn't.
Air Purifiers & Fresh Air Units
0–10V input gives continuous, linear speed adjustment. Quiet at low speed, which matters in bedrooms and offices.
The 250mm DC centrifugal blower is a common fit for higher-resistance duct systems in fresh air units.
Exhaust & Ventilation
A DC centrifugal fan can support fume extraction or general exhaust in mobile, container-based and remote equipment already using a 24V or 48V DC supply.
When connected through a compatible controller, fan speed can respond to a CO2 or VOC sensor instead of remaining fixed.
Consider AC or EC instead when only AC mains power is available and speed never changes (→ AC), or the fan serves room-level HVAC tied into a building BMS (→ EC). See the full AC vs DC vs EC technology comparison
04 / SPECIFICATIONS
DC Centrifugal Fan Specifications
Every model is a brushless DC centrifugal fan with backward-curved impeller. Every frame in this range shares the same build: an electrophoresis-coated rotor, die-cast aluminum housing, IP44 protection as standard (IP54 available on request), Class B insulation, mounting in any position, continuous (S1) operation, anti-clockwise rotation viewed toward the rotor, touch current under 3.5 mA, a -25°C to +60°C operating range, and maintenance-free ball bearings throughout.
Read Before You Spec
This IP rating describes the fan unit itself, not your finished enclosure. Mounting cutouts, cable entry points and duct openings all affect the assembly's actual ingress protection. Confirm your enclosure design against your target rating separately.
Maximum airflow and maximum static pressure occur at different points on the fan curve and cannot be achieved simultaneously. For your specific operating point, request the performance curve or contact us to confirm.
Grouped by shared performance curve, not flattened by SKU — models sharing one curve differ only in voltage and current draw. 26 curve groups, 48 published electrical variants across 11 frame sizes. Click a frame size to expand.
This range uses three motor variants: BLDC72, BLDC92 and BLDC102, each with its own lead wiring. Check the Motor column in your model's spec table above, then match it to the correct diagram below.
e.g. FC3E190PN48-90 = 190mm frame, plastic impeller, no bracket, 48V, motor variant 90
View full code legend
P Plastic impeller ·A Aluminum alloy impeller
N No bracket (default) ·K Bracket added, independent of the material letter — PN/AN ship without a bracket, PK/AK are the same electrical spec with one added
Order quantity affects your per-unit freight cost: more units per container means a lower landed cost per fan. Exactly how many fit in a 20ft or 40HQ container depends on the frame size and packaging, so we confirm the container fit for your specific model and order quantity at quotation rather than publishing one number that wouldn't apply across 11 different frame sizes.
View measurement standard
Noise figures are LpA (A-weighted sound pressure level) measured 1m from the fan axis. Airflow and static pressure are measured with a DJ inlet ring, no contact protection installed. Actual noise in your installation will vary with mounting and enclosure.
Size Range & Terminology
This range runs from 133mm up to 450mm. You may also see these listed as "DC blower" or "DC centrifugal blower" in older documentation — same product, same specs, just an earlier name. For example, the 250mm model is also listed under its earlier name, 250mm DC Centrifugal Blower.
Need something for high-pressure duty instead?
Looking for dedicated high-pressure blower duty rather than a centrifugal fan? The 310mm–450mm aluminum-impeller frames in this range are built for the high-airflow, heavy-duty end of this lineup. If your application needs a purpose-built high-pressure blower, see our high-pressure centrifugal blower guide
05 / SELECTION GUIDE
How to Select the Right DC Centrifugal Fan
Four things to pin down before you order. Get these right and the fan goes in without issues.
01
Voltage
Your system bus decides this. Most server and telecom applications run on 48V, which is why it's our most common order. 24V works for compact, low-power equipment. 85V and 110V cover industrial DC bus installations.
Not sure where you land? Start with 48V. Custom voltages are available on request for any frame size.
02
Frame Size
Start with your airflow target. The 133mm to 280mm range tops out at 3,084 m³/h using a plastic impeller. Above that, 310mm to 450mm use aluminum alloy impellers and handle the high-airflow, heavy-duty end.
Sitting between two sizes? Go with the bigger one: a fan running at 70% speed is quieter, cooler and lasts longer.
03
Speed Control Interface
First, check what signal your controller actually outputs. PWM runs at 25kHz with a 30–100% duty cycle range. PLCs and BMS systems usually output 0–10V, so that's the easier wiring option. Modbus RS-485 is also available for network-controlled installations.
No external inverter or frequency drive needed for any of the three.
04
IP Rating
Standard build is IP44, which handles most indoor and protected enclosure setups. Dusty or wet environments may need IP54 or higher, depending on the exposure and installation. Higher ratings are available on request. One thing to sort before ordering: some IP ratings are direction-specific, so confirm the installation orientation.
Not sure what the environment requires? Send us the details and we'll work out the right build.
Already know your target airflow and pressure?
Filter by voltage, control interface, frame size and discharge orientation, or look up an existing model number, in the DC Centrifugal Fan Selector.
Comparing across our AC, DC and EC lines at once? Use the cross-line selector on the Centrifugal Fan hub page
06 / ENGINEER'S NOTE
Two Things Worth Knowing Before You Spec
How Impeller Material Changes Across the Range
φ133–280mmPlastic Impeller
φ310–450mmAluminum Alloy
Frames from φ133mm up to φ280mm use a plastic impeller as the standard configuration; the φ310–450mm frames use aluminum alloy as standard, and aluminum can also be specified at smaller sizes on request. If you're speccing a custom frame, confirm the required material against your speed, operating temperature and installation conditions with our engineering team.
One Frame, Four Voltage Options
1.2Aat 48V
vs
2.4Aat 24V
Take the φ190mm frame: within the same speed series, published airflow, static pressure and input power stay the same at 24V and 48V, while rated current is roughly halved at 48V — the 48V DC fan draws 1.2A versus 2.4A at 24V.
Match the voltage to the DC supply already available in your system; adding a step-up or step-down converter solely to use a preferred frame size introduces extra components without providing an aerodynamic benefit.
07 / COMPARISON
DC vs AC vs EC Centrifugal Fan: Which One to Choose?
Three motor types, three different use cases. Pick the wrong one and you either overpay or end up rewiring.
DC makes sense when your equipment already runs on a DC bus — servers, telecom cabinets, battery-backed systems. You skip the AC-to-DC conversion stage, which removes a failure point and cuts idle losses. DC provides built-in low-voltage speed control: PWM and 0–10V built in, with Modbus RS-485 available, without the additional speed-control hardware many AC installations need. Choose AC for simple fixed-speed operation from an AC supply. Choose EC when part-load efficiency and building-level control integration matter more.
Three places selection mistakes actually happen, and what we check to prevent them.
Certification Confirmed Too Late
Risk
A fan gets selected on datasheet specs, and the certification question only surfaces once your equipment goes through third-party evaluation. Switching costs more than confirming would have.
Confirm
Certification coverage (CE) for your specific model, before it's designed in.
Our Response
We confirm certification coverage at quotation, before you commit the design.
Repeat Order Treated as Automatically Identical
Risk
An urgent reorder that skips a spec check against the original purchase can surface as a mismatch at incoming inspection, after the freight bill is paid.
Confirm
Model code, voltage and control signal against your original purchase record.
Our Response
We check reorders against order history before releasing to production.
Sample-to-Batch Variation
Risk
A fan can validate cleanly on the bench and still behave differently once mounted in your actual enclosure. Potting, thermal path and duty cycle can all shift speed, noise or current draw from what the datasheet showed.
Confirm
Mounting condition, duty cycle, control signal, operating temperature and acceptance tolerance.
Our Response
Sample specification is recorded and checked against the production order before manufacturing.
09 / CERTIFICATION & QUALITY
Certification & Documentation
Certification Coverage
CE — standard, all models
All DC centrifugal fan models carry CE marking and are manufactured under ISO 9001 quality management. We can send a labeled photo of the certification mark on request. The CE Declaration of Conformity ships with the order.
Documentation by Destination
EU
CE marking + Declaration of Conformity
North America
Test documentation & performance curves on request
Standard Export Documentation
Included with every order
Commercial invoice
Packing list
CE Declaration of Conformity
Available on request at quotation
Certificate of origin
Certificate of conformity
Test reports
Material certificates
Inspection records
Quality Control — Three Checkpoints
01
IQC — Incoming Inspection
Incoming inspection on raw materials and purchased components before production.
02
DUPRO — In-Process Inspection
Checkpoints at the 30% and 70% production marks to catch process drift before a full batch is affected.
03
PSI — Pre-Shipment Inspection
100% pre-shipment inspection on the finished lot before release.
IQC Incoming inspectionDUPRO Motor windingDUPRO Dynamic balancing testDUPRO Performance test benchPSI Outgoing inspection & packingPSI Burn-in aging test
10 / OEM SUPPLY
Custom DC Centrifugal Fans for OEM Buyers
We build to your spec. Send us the voltage, impeller material, PWM curve requirement or a competitor part number and we respond within 1 business day. Standard frame modifications carry no tooling fee.
Our range extends to 450mm, aluminum alloy from 310mm up, sized for equipment that needs more airflow than a compact DC centrifugal fan can deliver. If you've been told a size or spec can't be sourced, send us the requirement and we'll confirm what we can build.
Yes. Every brushless centrifugal fan in this range supports PWM (25kHz, 30–100% duty cycle) and 0–10V analogue input as standard; Modbus RS-485 is standard on the -90 and -20 series and can be added to the other series on request. No external inverter or frequency drive needed.
What voltages are available for DC centrifugal fans?
Standard options are 24V, 48V, 85V and 110V DC. 24V covers 133mm to 310mm, and 48V runs across the full 133mm to 450mm range. 85V and 110V are listed for 190mm to 280mm and can be built for other sizes on request. For non-standard voltages, custom builds from 12V to 110V are available on request.
What is the difference between a DC and AC centrifugal fan?
DC fans run on direct current (24V to 110V) and support variable speed without an external inverter. AC fans run on mains voltage (115V to 400V) and typically run at a fixed speed. In practice, it comes down to your power supply. Already have a DC bus? The fan connects straight in, no conversion stage, no extra hardware.
AC fans cost less upfront and suit fixed-duty applications. DC is the better fit for servers, telecom cabinets, battery-backed systems and anything where speed needs to vary with load.
What certifications do your DC centrifugal fans carry?
All models carry CE marking. Test reports and conformity docs are available for each frame size. Just let us know which model you need them for and we'll send them over.
Can you supply a custom voltage or frame size?
Yes. Voltage (12V to 110V), PWM curve, impeller material, housing finish and private label are all on the table. Standard frame modifications carry no tooling fee; fully custom frames or impeller tooling are confirmed during engineering review, and for volume orders above 1,000 pcs tooling can be amortized into the unit price. Send us a drawing, a datasheet or a competitor part number and we respond within 1 business day.
What is the airflow of the 280mm DC centrifugal fan?
The 280mm model delivers up to 3,084 m³/h at maximum speed, with a static pressure peak of 777 Pa. Voltage options run from 24V to 110V DC. PWM, 0–10V and Modbus RS-485 are all available on this model. Need the full curve at a specific operating point? Request the datasheet and we'll send it across.
What's the difference between 24V and 48V DC centrifugal fans?
For the same frame size and speed series, airflow, static pressure and power are identical — the only difference is current draw, which is roughly half at 48V compared to 24V. Choose based on which voltage your system already provides; adding a step-down or step-up converter just to use a different voltage adds a failure point for no aerodynamic gain.
Can DC centrifugal fans run on battery-backed power systems?
Yes — DC centrifugal fans connect directly to a battery-backed DC bus without an AC-to-DC conversion stage. This is a common setup in telecom cabinets, server backup power and other equipment where a battery sits between the mains supply and the load.
Do DC centrifugal fans need an external speed controller?
The motor drive is built into every fan, so no external inverter is required. PWM (25kHz), 0–10V analogue and Modbus RS-485 control are all available across the range. Variable-speed operation still needs a control signal supplied by your own controller.
What's the sample lead time for DC centrifugal fans?
Standard catalog products ship as samples in 3–7 days. OEM custom builds (voltage, impeller, PWM curve, private label and other modifications) ship as samples in 5–10 days. Volume orders take longer — 15–20 days for standard products, 18–25 days for custom builds.
What's the MOQ for custom DC centrifugal fan orders?
Development samples can be ordered from a single unit — there's no minimum. Volume and production orders start from 10 units for standard catalog models and 50 units for OEM custom builds, with quantity-based pricing confirmed at quotation.
Fig. 01Brushless DCφ133–450mm24 / 48 / 85 / 110V
