Frequently Asked
Questions

Available dimensions depend on the selected series. Browse the product list and verify the complete frame dimensions, thickness and mounting drawing for your exact model before ordering.

The catalog includes different DC voltage versions. Check the rated voltage and operating voltage range on the exact model page; do not apply the voltage range of one model to another.

HD (High-speed), MD (Medium-speed) and LD (Low-speed) are pre-set speed variants of the same physical fan model. HD delivers the highest airflow and static pressure at a higher noise level, LD runs quieter with reduced airflow, and MD sits in between. This lets you pick the performance/noise balance that fits your system without changing the fan footprint.

Bearing options depend on the model and configuration. Confirm the ordered bearing code, mounting orientation, ambient temperature and duty cycle against the model-specific documentation.

Service-life ratings depend on the exact model, bearing, test temperature, mounting and duty cycle. Request the relevant life rating and test conditions; a general hour figure should not be assumed to apply to every fan.

Ingress protection must be confirmed for the exact model and ordered configuration. Share dust, moisture and outdoor exposure requirements, and ask for the relevant rating and supporting documents before selection.

Share the required airflow at your system pressure, installation space, supply voltage and noise limit. Ask which existing model or configuration can meet the operating point, and confirm any custom development separately.

A free-air CFM number only tells you how much air the fan moves with nothing in its way. Once it's pushing air through a filter, heat sink, narrow duct, or a tightly packed enclosure, static pressure — not free-air CFM — determines real performance. Two fans with identical CFM ratings can have very different static pressure curves, so the one with lower static pressure will lose much more airflow under resistance. Share your enclosure's actual airflow path (filters, ducting, obstructions) and we can recommend a fan matched to your real back pressure, not just the datasheet's best-case number.

Herays supplies DC axial fans, PC case cooling fans, high-speed blower fans, centrifugal fans, and customized cooling fan solutions for electronics, computers, industrial equipment, power supplies, 3D printers, LED systems, and compact thermal management applications.

A DC axial fan moves air in a straight direction through the fan frame and is commonly used for general cooling and ventilation. A DC blower or centrifugal fan draws air from the inlet and pushes it out at an angle, usually with higher static pressure, making it suitable for narrow ducts, heat sinks, compact devices, and restricted airflow paths.

Choose higher airflow when the fan is moving air through an open space, such as a case exhaust or general ventilation. Choose higher static pressure when the fan must push air through resistance, such as filters, heat sinks, radiators, dense grills, ducts, or compact enclosures.

CFM means cubic feet per minute. It measures how much air the fan can move under standard test conditions. A higher CFM usually means more airflow, but real performance also depends on static pressure, system resistance, fan speed, blade design, and installation conditions.

Static pressure shows how well a fan can push air through resistance. It is usually listed in mmH2O, inH2O, or Pa. Fans with higher static pressure are better for filters, heat sinks, radiators, and tight airflow channels.

Yes. Common voltage options include 5V, 12V, 24V, and 48V DC, depending on the fan size and model. Custom voltage options may also be available for OEM/ODM projects.

Common DC axial fan sizes include 25mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 92mm, 120mm, 140mm, and larger industrial sizes. Thickness, airflow, speed, bearing type, and connector options can vary by model.

Herays fans can be supplied with sleeve bearing, hydraulic bearing, fluid dynamic bearing, ball bearing, or other bearing structures depending on the model and application. Ball bearing and FDB/HDB designs are often selected for longer service life, higher temperature use, or continuous operation.

Our MOQ is 100 pieces. Include the exact model, configuration and required quantity in your inquiry so the quotation can confirm the order details.

In-stock sample lead time is 1 week. Confirm availability, sample price and freight arrangements in the quotation; samples should not be assumed to be free.

Mass production lead time is 35 days. In-stock sample lead time is 1 week. Confirm availability, configuration, any custom development and the final shipping schedule in the quotation.

Ask our team to confirm accepted payment methods, deposit requirements and payment timing in the written quotation before placing an order.

MOQ is 100 pieces. Whether different models or configurations can be combined must be confirmed for your proposed order; send the quantity required for each model.

Send the exact model, configuration, per-order quantity and expected demand to request pricing. Any quantity discounts and validity period must be confirmed in the quotation.

Send your model or target dimensions, voltage, airflow at operating pressure, noise limit, required quantity and destination. MOQ is 100 pieces; in-stock samples take 1 week and mass production takes 35 days. Confirm final pricing and delivery arrangements in the quotation.

Ask which incoming, in-process and final inspections apply to your selected model and order. Agree on inspection coverage, acceptance criteria and available records before production; do not assume every unit receives every type of test.

Share your destination, order quantity and required arrival date. Ask our team to confirm available carrier and freight options, costs and delivery terms for the quotation.

Specify your preferred Incoterm and named place in the inquiry. Available terms, freight, insurance, duties and responsibilities must be confirmed in the written quotation.

Confirm packaging appropriate to the selected fan, transport method and order quantity. Include any ESD, carton, pallet, label or retail packaging requirements in your inquiry.

Provide the forwarder location and delivery requirements when requesting a quotation. Confirm whether the proposed arrangement is available, including domestic freight and handover responsibilities.

Transit time depends on destination, shipping method, carrier and customs clearance. Ask for a route-specific estimate; the 1-week in-stock sample lead time and 35-day production lead time are not guaranteed transport times.

Confirm the available shipment reference and tracking arrangements for your chosen carrier and freight method in the order details.

Tell us the destination and the documents required by your importer or customs agent. Confirm which invoices, packing documents, origin documents and model-specific compliance files can be provided before ordering.

Send your label, branding and packaging requirements with the model and quantity. Confirm feasibility, charges, minimum quantity and timing before approving the order.

Share dimensions, mounting, voltage, airflow at operating pressure, noise, wiring and environmental requirements. Custom design feasibility, development work, cost and schedule require separate confirmation.

Our stated MOQ is 100 pieces. For a custom design, tooling or special configuration, ask the quotation to confirm the applicable quantity, charges and development conditions.

Tell us your confidentiality requirements before sharing sensitive design documents. Any NDA must be separately reviewed and agreed by the parties.

Provide the reference model, datasheet and critical requirements. Ask us to review a potential alternative; equivalence must be checked against dimensions, wiring, control behavior and installed performance rather than assumed from a model name.

Custom development and prototype timing depend on the requested work and must be confirmed separately. The 1-week sample lead time applies to in-stock samples; mass production lead time is 35 days subject to the agreed order schedule.

Send the model, installation drawing, airflow path, power supply and control requirements. Ask what selection and integration information is available for the exact configuration.

Ask for the manufacturing and sourcing information relevant to the selected model, including which processes are performed by which facility. Production ownership and outsourcing arrangements must be verified rather than assumed from website illustrations.

Axial fans move air parallel to the motor shaft and are best for open-path airflow with low to medium resistance, such as ventilating an enclosure. Blower (centrifugal) fans generate higher static pressure and are better suited for pushing air through ducts, filters, or tightly packed components. Tell us your airflow path and resistance and we can recommend the right type.

These codes identify model-specific monitoring and control options. In the published function table, RD is an alarm output, FG is tachometer feedback, and PPWM is a PWM speed-control input. Verify the exact signal definition, voltage level, wiring and pinout for the ordered version; not every version includes every listed function.

Noise values are meaningful only with the relevant model's test conditions, including distance, voltage, speed and acoustic environment. Request those conditions and evaluate installed noise in your enclosure; do not assume one measurement setup applies to every model.

Use the operating and storage temperature ratings for the exact model and configuration. Share your ambient temperature, duty cycle, humidity and exposure conditions so suitability can be reviewed.

A common starting formula is CFM = (Watts to dissipate × 3.16) ÷ (allowable temperature rise in °F), adjusted for altitude and any airflow resistance in your enclosure. Send us your heat load and temperature rise target and our team can help size the right fan.

PWM (pulse-width modulation) speed control keeps the fan running at full voltage but varies the duty cycle of the drive signal, giving more precise and efficient speed control at low speeds. Voltage control simply reduces the supply voltage to slow the fan, which is simpler but less efficient and can affect starting torque at low voltages.

Protection behavior depends on the exact motor and controller configuration. Confirm whether locked-rotor protection, current limiting or automatic restart is included, and request the applicable operating conditions and wiring information.

Increasing noise can come from contamination, mounting, obstruction, resonance or bearing wear. Check the equipment manufacturer's maintenance guidance and share the model, operating conditions and noise description for review; noise alone does not identify the cause.

Mounting orientation can affect bearing lubrication and service life. Follow the exact model's approved orientation and life-test conditions, and describe whether the shaft is horizontal or vertical to avoid ambiguity.

Certification and declaration coverage must be confirmed for the exact model and ordered configuration. Tell us the destination market and applicable requirements, then request available supporting documents before ordering.

Specify the model, configuration and destination-country requirements. Ask which relevant certificates and declarations are available and verify their scope before relying on them for customs or product approval.

Share the inspection agency, scope, acceptance criteria and timing before ordering. Access, scheduling, fees and the applicable inspection arrangements require separate agreement.

REACH documentation must be checked for the exact model, material configuration and applicable substance-list version. Request the available declaration or test evidence rather than assuming coverage across all products.

Tell us which model, configuration, destination and applicable rules your project requires. Confirm whether an appropriate declaration is available and what it covers before using it in your own product documentation.

Ask which verified facility information or audit documents are available for the selected model and supply arrangement. Availability, disclosure permission and audit access must be confirmed.

Request the applicable quality-system evidence, product inspection requirements and available test records for your selected model. Confirm document scope and current validity; website illustrations are not certification evidence.

Herays is based in Guangdong, China and supplies DC axial fans, PC case fans and blowers. Ask our team for verified company and production information relevant to your supplier review.

Contact our team with the model, purpose of the visit and proposed dates. Facility access, host arrangements and any audit requirements must be confirmed before travel.

Request the warranty duration, coverage, exclusions and claims procedure for the exact model in the written quotation. Warranty terms must be confirmed before placing an order.

Contact [email protected] with the order reference, exact model, issue description and operating conditions. Include relevant photos, wiring details and measurements so the issue can be reviewed.

You can submit your model, application and purchasing requirements in English through the website form or email [email protected].

Our fans are used across telecom equipment, server and data center cooling, industrial machinery, power supplies, LED lighting, medical devices, and other applications requiring reliable forced-air cooling.

Send the complete model number, including housing or configuration suffixes. Ask for the available datasheet, dimensions, performance information and wiring details for that exact version.

Request verified company, manufacturing-location and supply-chain information for your target model. Confirm the respective roles of the seller and production facility, available audit evidence and any visit arrangements before approving a supplier.

Tell us your industry and application, and ask whether relevant public examples or permission-cleared references are available. Customer information can only be disclosed with appropriate authorization.