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

The motor has a wide voltage tolerance (5V-13V). It might not start below ~7V but will spin at 5V.

Do more blades mean better performance?

More blades provide higher static pressure but are slightly louder. Fewer blades provide higher airflow and lower noise. A balance of 7-9 blades is typical.

How do I know if the fan is dying?

Listen for clicking/grinding (bearing failure), check RPM drops via software, or power off and flick the blade; wobble or stiffness indicates worn bearings.

40X40X7mm Low Noise & Durable DC Brushless Frameless Cooling Fan for Air Purifier Cooling

Name: 40X40X7mm Low Noise & Durable DC Brushless Frameless Cooling Fan for Air Purifier Cooling
Brand: Fengxia Motor (Shanghai) Co., Ltd.
SKU: 2153598322

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

US$2.30

500-4,999 Pieces

US$1.00

5,000+ Pieces

Sample price:US$4.00/piece.Request sample

Product profile

Customization

Available

Material

Plastic-Iron-Copper-Magnet

Blade Material

PBT 94ulv

Model NO.

FX4007

Type

DC Frameless Bracket 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

Trademark

FUNSHARE

Origin

China

Production Capacity

100000 Pieces/Year

Key features

Ultra-Quiet Operation: Designed for low noise performance, suitable for air purifiers and quiet environments.

High Durability: Features durable PBT 94ulv blades and robust construction for extended service life.

Wide Voltage Tolerance: Operates effectively within a 5V to 13V range, ensuring compatibility with various power sources.

Customization Available: Offers full customization from samples or designs to meet specific client requirements.

Certified Quality: Meets RoHS, ISO, CE, and FCC standards for safety and environmental compliance.

Versatile Application: Ideal for air purifiers, notebooks, projectors, UAVs, and VR headsets.

Efficient Heat Dissipation: Ensures stable operation and prevents overheating in compact electronic devices.

Compact Design: Small 40x40x7mm form factor fits easily into space-constrained devices.

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/software, or consider bearing type (sleeve is quietest but wears faster; hydraulic is a middle ground).

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 auto speed control, offering quieter and more precise operation. A 4-pin fan on a 3-pin header runs at 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 of 24/7 use.

Q:How can I make the fan quieter?

Use rubber pegs/grommets instead of screws, use an inline resistor or low-noise adapter to lower voltage, or adjust the BIOS fan curve to keep RPM low until temperatures rise.

Q:Should I connect the fan to the motherboard or power supply?

Connect to the motherboard header for speed control (best with 4-pin PWM). Connecting to a PSU Molex runs it at 12V full speed, which is simpler but noisier.