Author: longwell

Shaded-pole, PSC vs EC motors compared for cost and energy use
By longwell / September 5, 2026 / Fan Engineering Guides

Shaded-Pole vs PSC vs EC Motor (Cost & Energy)

The purchase price ordering is the opposite of the running cost orderi...

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Control panel switching variable speed fans between duty levels
By longwell / September 5, 2026 / Fan Engineering Guides

Fixed Speed vs 2-Speed vs Variable Speed Fans

Two-speed operation captures a surprising share of the variable speed ...

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Upblast and downblast roof exhaust fans installed on a flat roof
By longwell / September 5, 2026 / Fan Engineering Guides

Roof Exhaust: Upblast vs Downblast

The difference is where the air goes when it leaves. Upblast throws it...

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5 Myths About Fans, Debunked
By longwell / September 5, 2026 / Fan Engineering Guides

5 Myths About Fans, Debunked

Five fan myths can distort airflow decisions and create maintenance ha...

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Fan Wall Controls and Staging: How to Balance Fan Count and Speed
By longwell / September 5, 2026 / Fan Engineering Guides

Fan Wall Controls and Staging: How to Balance Fan Count and Speed

Design a stable fan wall sequence by validating sensors, separating sp...

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How to Measure an Old Fan for Replacement: Fit and Duty Checks
By longwell / September 5, 2026 / Fan Engineering Guides

How to Measure an Old Fan for Replacement: Fit and Duty Checks

Build a useful fan replacement record: identify rigid datums, measure ...

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Fan Guard Selection: Access, Strength and Safety Checks
By longwell / September 4, 2026 / Fan Engineering Guides

Fan Guard Selection: Access, Strength and Safety Checks

Assess fan guards by access routes, opening geometry, strength and saf...

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Fan System TAB: A Practical Testing and Balancing Checklist
By longwell / September 4, 2026 / Fan Engineering Guides

Fan System TAB: A Practical Testing and Balancing Checklist

Plan fan system testing, adjusting and balancing with a clear baseline...

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Roof Curb and Flashing for Exhaust Fans: What to Check Before Installation
By longwell / September 4, 2026 / Fan Engineering Guides

Roof Curb and Flashing for Exhaust Fans: What to Check Before Installation

Coordinate the fan base, structural support and roof flashing before i...

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How to Reduce Duct Static Pressure Without Losing Airflow
By longwell / September 4, 2026 / Fan Engineering Guides

How to Reduce Duct Static Pressure Without Losing Airflow

Find avoidable duct resistance with matched-flow measurements, compone...

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