What causes the fan to be too loud?

Noise can be caused by loose mounting screws (vibration), dust accumulation (increased resistance), or the bearing type. Sleeve bearings are quieter initially but wear out, while double-ball bearings last longer but are louder.

How do I know if the fan is dying?

Listen for clicking or grinding sounds indicating bearing failure. Check RPM using software like HWMonitor; significantly lower RPM than specified is a warning. Also, check if blades spin freely when powered off; wobble or stiffness indicates worn bearings.

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

Yes, you can connect to a PSU Molex connector for simple 12V full-speed operation, though it may be louder. If using a splitter, ensure the total current per header does not exceed 1A.

20204mm DC Blower with Superior Airflow - China Origin

Name: 20*20*4mm DC Blower with Superior Airflow - China Origin
Brand: Fengxia Motor (Shanghai) Co., Ltd.
SKU: 2130196852

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

20*20*4mm DC Blower with Superior Airflow - China Origin

US$2.30-2.90

1,000 Pieces

Sample price:US$2.50/piece.Request sample

Product profile

Customization

Available

Material

Aluminum Fan

Blade Material

PBT 94ulv

Model NO.

2004 DC Blower

Type

DC Blower Fan

Electric Current Type

Mounting

Free Standing

Certification

RoHS, ISO, CE

Transport Package

Paper Box

Specification

20*20*4mm

Origin

China

Production Capacity

100000 Pieces/Year

Key features

Wide Voltage Range: Operates reliably within a 5V-13V wide tolerance range for versatile power compatibility.

Multiple Bearing Options: Choose from sleeve, hydraulic, or double-ball bearings for varying noise and lifespan needs.

Customization Support: Offers full customization from samples, designs, and OEM/ODM services to meet specific requirements.

Premium Materials: Constructed with Aluminum Fan and PBT 94ulv Blade Material for durability and performance.

Global Certifications: Certified with RoHS, ISO, CE, and ISO9001:2015, ensuring international quality standards.

Versatile Application: Suitable for UAVs, automotive, medical, industrial controls, and refrigeration systems.

100% Quality Inspection: Every finished product undergoes strict visual and functional inspection before shipment.

Flexible Pin Configuration: Available in 3-pin (DC control) and 4-pin (PWM) options for precise speed management.

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: ≤3.13h

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, allowing the motherboard to auto-adjust speed for quieter and more precise control. A 4-pin fan can fit a 3-pin header but will run at full speed or DC mode.

Q:How long does the fan last?

Lifespan depends on the bearing type: Sleeve bearing lasts ~2-3 years; Hydraulic bearing lasts ~4-5 years; Double-ball bearing lasts 5-10 years and is capable of 24/7 operation.

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

Most motors have a wide voltage tolerance and can run between 5V and 13V. However, they may not start if the voltage drops below approximately 7V.

Q:How can I reduce fan noise?

Ensure screws are tight to reduce vibration, remove dust to lower resistance, use rubber grommets instead of screws, or use a low-noise adapter to lower voltage. You can also adjust the fan curve in BIOS to keep RPM low until temperatures rise.

Q:Which direction should the fan face?

Look for arrows on the frame: arrows pointing out indicate exhaust, and arrows pointing in indicate intake. Generally, front/side fans are for intake, and rear/top fans are for exhaust.