1. Define the application before the product
Describe the object, operating distance, required effect, duty cycle, environment, operator and failure consequence. Personal cooling, electronics cleaning and pressure against a restriction are different tasks and should not share one acceptance criterion.
2. Choose the correct performance metric
| Metric | Use it to answer | Common mistake |
|---|---|---|
| RPM | How fast the motor or impeller rotates | Treating speed as proof of delivered air performance |
| Air speed | How fast air moves at a defined point | Omitting distance, position or mode |
| Airflow | How much air volume moves through an area | Inferring volume from a single velocity peak |
| Static pressure | How the fan performs against restriction | Using free-air speed for a restricted application |
| Noise | Acoustic impact in the intended setting | Comparing values measured at different distances |
3. Specify electrical and battery behavior
Record battery type and version, rated capacity, usable runtime by mode, power draw, charging input, charge time, protection behavior and operation while charging if relevant. Ask for transport and safety documents applicable to the selected battery and complete product.
4. Define physical and user requirements
Include dimensions, weight, grip, control logic, display, intake and outlet protection, housing materials, cleaning, storage, accessories and packaging. Confirm which surfaces or temperatures users may contact.
5. Write acceptance criteria
- Requirement and unit.
- Test method, fixture and instrument.
- Distance, position, mode and battery condition.
- Sample count and allowed variation.
- Pass/fail limit and treatment of exceptions.
- Responsible reviewer and approval record.
6. Compare the whole sourcing offer
Evaluate the controlled specification, evidence, sample consistency, change control, packaging, documents, communication and commercial terms. A lower unit quote may not be the lower project cost when requirements are ambiguous.
Do not approve a model from a marketing image or a single peak number. Approve a defined configuration against a written method and record.
RFQ fields to copy
Application: ___ Working distance: ___ Target metric: ___ Noise limit and method: ___ Runtime by mode: ___ Charging: ___ Dimensions/weight: ___ Destination market: ___ Quantity: ___ Branding/packaging: ___ Required documents: ___ Schedule: ___