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

Most motors have a wide tolerance (5V-13V). However, they may not start below ~7V even if they spin at 5V.

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 if the fan is dying?

Listen for clicking/grinding, check RPM via software (far below spec is a red flag), or power off and flick the blade; wobble or stiffness indicates worn bearings.

38405mm High Performance Brushless Cooling Centrifugal DC Blower

Name: 38*40*5mm High Performance Brushless Cooling Centrifugal DC Blower
Brand: Fengxia Motor (Shanghai) Co., Ltd.
SKU: 2242198185

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

38*40*5mm High Performance Brushless Cooling Centrifugal DC Blower

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.

4005 DC Blower

Type

DC Blower Fan

Electric Current Type

Mounting

Free Standing

Certification

RoHS, ISO, CE

Transport Package

Paper Box

Specification

38*40*5mm

Origin

China

Production Capacity

100000 Pieces/Year

Key features

Wide Voltage Compatibility: Operates effectively within a 5V-13V range, ensuring stability across various power sources.

Multiple Bearing Options: Available in sleeve, hydraulic, and double-ball bearings for different lifespan and noise needs.

Customization Services: Supports full customization from samples, designs, or OEM/ODM services to meet specific needs.

Multi-Industry Application: Widely used in automotive, medical, communication, and refrigeration systems globally.

International Certifications: Products hold RoHS, CE, ISO, and FCC certifications ensuring high quality and safety standards.

High Quality Assurance: 100% finished product inspection with ISO9001:2015 certified management system.

Aluminum and PBT Materials: Constructed with durable Aluminum Fan and PBT 94ulv Blade material for longevity.

Fast Delivery: Standard lead time of one month for both peak and off-season periods.

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: ≤3.33h

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 quiet but wears out; double-ball lasts longer; hydraulic is a middle ground).

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 the rear exhaust.

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

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 at full speed.

Q:How long will the fan last?

Sleeve bearing lasts ~2-3 years, hydraulic bearing ~4-5 years, and double-ball bearing 5-10 years (suitable for 24/7 use).

Q:How can I make the fan quieter?

Use rubber pegs instead of metal screws, use a low-noise adapter to drop voltage, or adjust BIOS fan curves to keep RPM low until temperatures rise.