How do I know if the fan is dying?

Listen for clicking or grinding noises indicating bearing failure. Check RPM using software like HWMonitor; significantly lower RPM than spec signals issues. Also, check if blades spin freely without wobble.

What should I do if the fan is too loud?

Check for loose screws causing vibration, remove dust buildup that increases resistance, lower RPM via BIOS/software, or consider switching to hydraulic bearings for a quieter operation.

Can I connect the fan to the power supply instead of the motherboard?

Yes, connecting to a PSU Molex connector runs the fan at 12V full speed, which is simple but noisier. Motherboard headers enable speed control, which is best for 4-pin PWM fans.

20×20×4mm PWM Control Ultra-Thin DC Blower Fan for Communication Equipment

Name: 20×20×4mm PWM Control Ultra-Thin DC Blower Fan for Communication Equipment
Brand: Fengxia Motor (Shanghai) Co., Ltd.
SKU: 2151476182

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

US$2.90

500-4,999 Pieces

US$2.30

5,000+ Pieces

Sample price:US$4.00/piece.Request sample

Product profile

Customization

Available

Material

Aluminum Fan

Blade Material

PBT 94ulv

Model NO.

2004

Type

DC Blower Fan

Electric Current Type

Mounting

Free Standing

Certification

RoHS, ISO, CE

Insulation Resistance

10mωor Over with at DC250V Megger

Ielectric Withstand Voltage

AC500V1s

Ambient Temperature

-10℃~+70℃(Operating) -40℃~+70℃(Storage)

Expected Life

+40° ,30000 Hours

Transport Package

Paper Box

Specification

Customized

Origin

China

Production Capacity

100000 Pieces/Year

Key features

Ultra-Thin Design: Compact 20x20x4mm size ideal for space-constrained devices like VR headsets and UAVs.

PWM Speed Control: 4-pin PWM interface enables precise, quiet, and automatic speed adjustment for optimal cooling.

High Durability: Double-ball bearings offer 5-10 year lifespan, suitable for 24/7 continuous operation.

Wide Voltage Range: Operates reliably on 5V-13V, providing flexibility for various power supply configurations.

Multi-Certification: Meets RoHS, CE, FCC, and ISO9001 standards for global compliance and quality assurance.

Customization Service: Supports full customization from samples or designs to meet specific client requirements.

Low Noise Operation: Hydraulic and sleeve bearing options provide ultra-quiet performance for sensitive environments.

Professional Support: Expert guidance and comprehensive technical support for integration and troubleshooting.

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: ≤3.02h

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 is the difference between 3-pin and 4-pin fans?

3-pin fans use DC voltage control for fixed or stepped speeds. 4-pin fans use PWM for automatic, precise, and quieter speed control. A 4-pin fan on a 3-pin header runs at full speed.

Q:How long will the fan last?

Lifespan depends on the bearing type: Sleeve bearings last ~2-3 years; Hydraulic bearings last ~4-5 years; Double-ball bearings last 5-10 years and tolerate 24/7 operation.

Q:How can I make the fan quieter?

Use rubber grommets instead of screws to reduce vibration, use a low-noise adapter to lower voltage, or adjust the BIOS fan curve to keep RPM low until temperatures rise.

Q:Which direction should the fan face?

Check arrows on the frame. Generally, front/side fans are for intake (cool air in), and rear/top fans are for exhaust (hot air out). Tower coolers push air toward the rear exhaust.

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

The motor has a wide voltage tolerance and can run on 5V-13V. However, it might not start if the voltage drops below approximately 7V.