Should I connect to motherboard or power supply?

Motherboard header enables speed control (best for 4-pin PWM). PSU Molex runs at 12V full speed (simple but noisy). Keep total current per header under 1A.

Why does the fan spin at 5V if labeled 12V?

The motor has a wide tolerance (5V-13V). It might not start below ~7V but can spin at 5V. Note that performance may vary at lower voltages.

Do more blades mean better performance?

More blades increase static pressure but may be 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 via software; significantly lower RPM signals issues. Power off and flick the blade; wobble or stiffness indicates worn bearings.

18X18X4mm Stable Airflow Small DC Blower Fan for Power Supply Cooling

Name: 18X18X4mm Stable Airflow Small DC Blower Fan for Power Supply Cooling
Brand: Fengxia Motor (Shanghai) Co., Ltd.
SKU: 2154940752

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

US$3.00

500-4,999 Pieces

US$2.50

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.

1804

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

Trademark

FUNSHARE

Origin

China

Production Capacity

100000 Pieces/Year

Key features

Wide Voltage Compatibility: Operates reliably within a 5V to 13V voltage range for versatile power supply integration.

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

Customization Services: Offers full customization from samples or designs, including OEM and ODM services.

Quality Certifications: ISO9001 certified with FCC, CE, and ROHS compliance ensuring high safety standards.

Compact Design: Small 18x18x4mm size ideal for notebooks, projectors, UAVs, and VR headsets.

High Durability: Double-ball bearings last 5-10 years, suitable for 24/7 continuous operation.

Efficient Heat Dissipation: Optimized blade design ensures stable operation and extended device service life.

Professional Support: Expert guidance and full customization options tailored to specific customer needs.

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: ≤3.30h

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 causes fan noise and how to fix it?

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

Q:Which direction should the fan face?

Look for arrows on the frame: intake (cool air in) is usually front/side, exhaust (hot air out) is rear/top. Tower coolers push air toward the 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 auto speed control, offering quieter and more precise operation. 4-pin on 3-pin header runs at full speed.

Q:How long does the fan last?

Sleeve bearing lasts ~2-3 years. Hydraulic bearing lasts ~4-5 years. Double-ball bearing lasts 5-10 years and tolerates 24/7 operation.

Q:How can I make the fan quieter?

Use rubber pegs 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.