What information should I send to request a custom cooling fan?
Send the operating point and the interface, and the RFQ answers itself: airflow and static pressure at that airflow (not just free-air CFM), the temperature and altitude the values are based on, voltage and tolerance, control interface (PWM/FG/RD), connector and pinout, available envelope, noise target, life assumption and quantity. Anything missing becomes a round of questions — or a wrong selection.
The eight items that make an RFQ complete
Each item below either selects the fan or eliminates a wrong one. The operating point is the heart of it: a flow figure at zero pressure tells a selection engineer almost nothing.
- Operating point: airflow AND static pressure at that airflow.
- Environment basis: ambient temperature and altitude the requirement is stated at.
- Voltage: nominal plus tolerance (e.g. 12 V ±10%).
- Control interface: PWM control? FG/TACH? RD alarm? Speed curve targets.
- Connector: type, pitch, pinout, wire exit direction, length.
- Envelope: L×W×T limit, hole pattern, airflow direction, sealing needs.
- Acoustic target: dB(A) or sones at a stated distance and operating point.
- Life ＆ quantity: expected service life/duty, and volume basis.
What happens with the information
A complete RFQ gets mapped to a candidate (standard frame, custom variant, or full custom) with the P-Q curve intersection checked against your stated operating point, the electrical interface matched item by item, and a sample plan proposed with the validation data you will need for your qualification file. An incomplete RFQ gets the questions back — the two-to-three-day style delay that a five-line checklist avoids.
- State any certification or environmental testing the product must pass.
- Mention the incumbent part number if this is a replacement — cross-reference data helps.
- Say what the fan must NOT do (e.g. no audible PWM whine, no oil migration risk in any orientation).
Send MEGA Tech your airflow and static pressure target, voltage, size limit, control interface, quantity and environment. We reply with a selection proposal and a sample plan — selection by operating condition, samples validated on your unit.
WhatsApp +86 135 7056 7086 · Email inquiry@cnmegatech.com · Custom fan development