Should I connect to the motherboard or power supply?

Motherboard header enables speed control (best for 4-pin PWM). PSU Molex runs at 12V full speed (simple but loud). Stay under 1A per header when using splitters.

Why does the fan spin at 5V if the label says 12V?

Most motors have a wide tolerance of 5V-13V. However, they may not start below approximately 7V.

Does having more blades mean better performance?

More blades increase static pressure (good for radiators) but may be louder. Fewer blades increase airflow (good for ventilation) with lower noise. 7-9 blades is a typical balance.

How do I know the fan is dying?

Listen for clicking/grinding (bearing failure). Check RPM via software; far below spec is a red flag. Power off and flick blades; wobble or stiffness indicates worn bearings.

20206mm Energy Saving Big Airflow Axial Flow Cooling DC Fan

Name: 20*20*6mm Energy Saving Big Airflow Axial Flow Cooling DC Fan
Brand: Fengxia Motor (Shanghai) Co., Ltd.
SKU: 2242426685

Shanghai, ChinaFengxia Motor (Shanghai) Co., Ltd.

20*20*6mm Energy Saving Big Airflow Axial Flow Cooling DC Fan

US$2.50-3.00

1 Piece

Sample price:US$2.50/piece.Request sample

Product profile

Customization

Available

Material

Aluminum Fan

Blade Material

PBT 94ulv

Model NO.

2006 DC Fan

Type

Axial Fan

Electric Current Type

Mounting

Free Standing

Certification

RoHS, ISO, CE

Transport Package

Paper Box

Specification

20*20*6mm

Origin

China

Production Capacity

100000 Pieces/Year

Key features

High Airflow Design: 20*20*6mm size optimized for big airflow and energy saving performance.

Durable Materials: Aluminum fan frame with PBT 94ulv blade material for stability.

Multiple Certifications: Passed RoHS, ISO, CE, and FCC certifications for quality assurance.

Customization Service: Supports OEM/ODM, customization from samples, designs, and full customization.

Wide Voltage Range: Works with 5V-13V tolerance, suitable for various DC power sources.

Long Lifespan Options: Double-ball bearing lasts 5-10 years; hydraulic bearing lasts 4-5 years.

100% Inspection: Every finished product undergoes visual and function inspection.

Versatile Application: Used in UAVs, automotive, medical, and industrial control equipment.

Company profile

Importers and ExportersHigh Repeat Buyers Choice

Fengxia Motor (Shanghai) Co., Ltd.

Shanghai, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: ODM Service Available & OEM Service Available CertifiedCustomization Options: Customization from Samples, Customization from Designs, etc. CertifiedExport Year: 5 Years CertifiedNearest Port: Shanghai PortAverage Response Time: ≤3.17h

AI-Powered supplier vetting

SummaryThe supplier demonstrates strong customization, R&D, OEM/ODM, quality-control, and complaint-handling capabilities. It reports new products within the past year, provides customization from samples and designs through full customization, and serves known brands through OEM. Production includes two lines, inventory capability, defined inspection procedures, and four QA/QC inspectors. However, important operational limitations exist: no available SDK, no overseas agents, branches, warehouse, or showroom, no offline trade-show participation, and only one experienced export-trade employee. Manufacturing controls also show gaps, including no ongoing quantity reconciliation for each batch and no standard operating procedure for outsourced manufacturing. Financial evidence is represented only by years rather than substantive indicators, so credibility cannot be determined. The supplier holds an ISO9001:2015 certificate, but the available information does not establish broader certification coverage.

Supplier typeThe supplier operates as a manufacturer with two production lines, provides OEM and ODM services, offers inventory capability, and accepts FOB and EXW quotations. It also provides full customization, but lacks overseas agents, branches, warehouses, and showrooms.

CertificationsThe supplier reports an ISO9001:2015 certificate. No additional specific certifications are identified in the provided information.

After-Sales capabilityThe supplier has documented and followed procedures for customer complaints and corrective/preventive actions, supporting an established service-response process. However, it has no overseas agents, branches, warehouse, or showroom, which limits demonstrated overseas service infrastructure.

R&D capabilityThe supplier reports new products in the past year, provides ODM services, and assigns R&D personnel to product development, design drawings, production support, and specifications. Nevertheless, it has no available SDK and no design input, output, review, validation, or confirmation documents available for audit.

Production capacityProduction evidence includes two production lines, inventory capability, one-month average lead times in both peak and off-season periods, four QA/QC inspectors, written finished-product inspection instructions, and multiple listed production machines. Controls are weakened by the absence of ongoing batch quantity reconciliation and a standard operating procedure for outsourced manufacturing.

Customization capabilityThe supplier explicitly supports customization from samples, customization from designs, and full customization, with the same capability reported under both R&D and design services. This directly demonstrates broad customization coverage.

Product Q&A

Q:What should I do if the fan is too loud?

Check for loose screws causing vibration, remove dust buildup, lower RPM via BIOS, or consider bearing type (sleeve is quietest but wears faster).

Q:Which direction should the fan face?

Follow arrows on the frame: intake (cool air in) for front/side, exhaust (hot air out) for rear/top. Tower coolers push air toward rear exhaust.

Q:What is the difference between 3-pin and 4-pin connectors?

3-pin uses DC voltage control for fixed/stepped speeds. 4-pin uses PWM for automatic, quieter, and more precise speed control. 4-pin plugs into 3-pin but runs full-speed.

Q:How long will the fan last?

Sleeve bearing: ~2-3 years. Hydraulic bearing: ~4-5 years. Double-ball bearing: 5-10 years (tolerant to 24/7 use).

Q:How can I make the fan quieter?

Use rubber pegs/grommets, use an inline resistor or low-noise adapter to drop voltage, or adjust BIOS fan curves to keep RPM low until temperature rises.