Day: September 12, 2026

Fan P-Q curve with the duty point 8,000 m3/h at 600 Pa marked: grade C1, 22% margin, two higher grades in reserve
By longwell / September 12, 2026 / Fan Engineering Guides

Fan Curve Margin Explained: Why 10–25% Static Pressure Reserve Is the Sweet Spot

What the static-pressure margin on a fan curve measures, why 10–25% is...

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fan selector results 33 models 8000 m3h 600 pa
By longwell / September 12, 2026 / Technical Articles

Fan Selection Software vs. an Online Fan Selector: What Engineers Need in 2026

What a browser-based fan selector must do for engineers and OEM design...

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longwell fan selector home duty point
By longwell / September 12, 2026 / Fan Engineering Guides

How to Select a Fan by Duty Point: Airflow, Static Pressure and the 10–25% Margin Rule

The duty-point method for fan selection, step by step on the free LONG...

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