Direct Answer
Airflow is the volume moved; static pressure is the resistance the fan must overcome. The real operating point is where the fan curve meets the system curve.
Suitable For
- Fan buyers comparing models
- Duct-system designers
- Teams troubleshooting low airflow
Not Suitable For
Core terms
| Term | Meaning |
|---|---|
| Airflow | Volume per unit time |
| Static pressure | Pressure used to overcome resistance |
| Fan curve | Fan capability across flow |
| System curve | Resistance across flow |
| Duty point | Intersection of fan and system curves |
Step-by-step Process
- Define target airflow
- Estimate fittings and duct losses
- Build or obtain the system curve
- Overlay the fan curve
- Check margin without oversizing
Buyer Checklist
- Airflow unit
- Pressure unit
- Duct length
- Filter loss
- Elbows and dampers
- Operating density
Information Needed for Quotation
- Required airflow
- Required static pressure
- Duct sketch
- Filter and equipment losses
- Voltage
Frequently Asked Questions
What is the main decision in this airflow vs static pressure in fan selection?
Airflow is the volume moved; static pressure is the resistance the fan must overcome. The real operating point is where the fan curve meets the system curve.
What should be documented before approval?
Airflow unit; Pressure unit; Duct length; Filter loss; Elbows and dampers.
Can this checklist replace product or legal compliance review?
No. Use it to organize the commercial and technical review, then confirm market-specific compliance with qualified parties where required.
Related Pages
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