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

Connect to the motherboard header for speed control (best with 4-pin PWM), or to PSU Molex for full 12V speed.

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

Most motors have a wide tolerance (5V-13V) but may not start below ~7V.

Are more blades better for performance?

More blades increase static pressure (good for radiators) but may be louder; fewer blades increase airflow (good for ventilation).

How do I know the fan is dying?

Listen for clicking/grinding, check for significantly low RPM via software, or test if blades spin freely without wobble.

30304mm Sleeve Bearing Brushless Cooling Centrifugal DC Blower

Name: 30*30*4mm Sleeve Bearing Brushless Cooling Centrifugal DC Blower
Brand: Fengxia Motor (Shanghai) Co., Ltd.
SKU: 2242176745

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

30*30*4mm Sleeve Bearing Brushless Cooling Centrifugal DC Blower

US$1.80-2.80

1 Piece

Sample price:US$2.50/piece.Request sample

Product profile

Customization

Available

Material

Aluminum Fan

Blade Material

PBT 94ulv

Model NO.

3004 DC Blower

Type

DC Blower Fan

Electric Current Type

Mounting

Free Standing

Certification

RoHS, ISO, CE

Transport Package

Paper Box

Specification

30*30*4mm

Origin

China

Production Capacity

100000 Pieces/Year

Key features

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

Multi-Bearing Options: Available in sleeve, hydraulic, and double-ball bearings to suit different noise and lifespan needs.

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

International Certifications: Products hold RoHS, ISO, CE, and FCC certifications for global market compliance.

High-Quality Materials: Constructed with Aluminum fans and PBT 94ulv blades for durability and heat resistance.

100% Quality Inspection: Every unit undergoes visual and functional inspection before shipping to ensure stability.

Versatile Applications: Suitable for automotive, medical, communication equipment, and refrigeration systems.

Professional Technical Support: Provides guidance on mounting, wiring, and troubleshooting for optimal performance.

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.