Fan Engineering Guides

Video-led explanations of fan operation, selection, testing and system behavior for HVAC and equipment engineers.

Explosion-proof fans installed in a classified hazardous area
By longwell / September 5, 2026 / Fan Engineering Guides

Explosion-Proof Fans for Hazardous Areas

Hazardous area fan selection starts with the zone, not the fan. Classi...

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Jet fans mounted on a car park ceiling for impulse ventilation
By longwell / September 5, 2026 / Fan Engineering Guides

Jet Fans for Car Park Ventilation

Impulse ventilation replaces a ceiling full of ductwork with a line of...

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Tunnel ventilation jet fans mounted at the tunnel crown
By longwell / September 5, 2026 / Fan Engineering Guides

Tunnel Ventilation Fans Explained

Tunnel ventilation handles two very different jobs: diluting vehicle e...

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Aeration blowers supplying air to submerged pond diffusers
By longwell / September 5, 2026 / Fan Engineering Guides

Pond & Lake Aeration Blowers

Aeration blowers work against water pressure rather than duct resistan...

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Food truck exhaust hood blower mounted on a mobile kitchen roof
By longwell / September 5, 2026 / Fan Engineering Guides

Food Truck Exhaust Hood Blower

A food truck hood does everything a restaurant hood does, in a fractio...

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Axial, mixed-flow and centrifugal fan impellers compared side by side
By longwell / September 5, 2026 / Fan Engineering Guides

Axial vs Mixed-Flow vs Centrifugal

Mixed-flow fans sit between axial and centrifugal, delivering roughly ...

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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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