Fan Engineering Guides

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

How Much CFM Per Person? A Ventilation Design Guide
By longwell / September 6, 2026 / Fan Engineering Guides

How Much CFM Per Person? A Ventilation Design Guide

There is no universal CFM-per-person answer: ventilation design must c...

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Top 5 Fan Failures & How to Prevent Them
By longwell / September 6, 2026 / Fan Engineering Guides

Top 5 Fan Failures & How to Prevent Them

Five common fan-failure categories become easier to prevent when sympt...

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Auditor reviewing records while learning how to audit a fan factory
By longwell / September 6, 2026 / Fan Engineering Guides

How to Audit a Fan Factory (Remote & On-site)

A useful audit looks at records rather than at tidy floors. Balancing ...

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Engineer measuring an obsolete fan to specify a replacement
By longwell / September 6, 2026 / Fan Engineering Guides

Replacing a Discontinued / Obsolete Fan

When the original is gone and the datasheet went with it, you have to ...

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Private label fans with custom branding on packaging and product labels
By longwell / September 6, 2026 / Fan Engineering Guides

Private Label Fans: Put Your Brand on It

Private label is the fastest route to a branded product, and it comes ...

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Whole house fan installed in a ceiling compared with an attic fan
By longwell / September 6, 2026 / Fan Engineering Guides

Whole House Fan vs Attic Fan: Which Cools Better

They sound similar and do completely different jobs. One replaces the ...

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Attic ventilation fan installed on a roof with soffit intake vents
By longwell / September 6, 2026 / Fan Engineering Guides

Attic Ventilation Fan Sizing & Install

An attic fan without enough intake venting pulls air out of the house ...

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Duct booster fan installed in a branch duct to improve airflow
By longwell / September 6, 2026 / Fan Engineering Guides

Duct Booster Fan: Does It Actually Work?

Booster fans work when the problem is a long branch and fail when the ...

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Dryer vent booster fan fitted in a long laundry exhaust duct
By longwell / September 6, 2026 / Fan Engineering Guides

Dryer Vent Booster Fan Install

Long dryer ducts strangle airflow, extend cycles and accumulate lint. ...

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Crawl space ventilation fan installed in a foundation vent
By longwell / September 6, 2026 / Fan Engineering Guides

Crawl Space Ventilation Fan Guide

Ventilating a crawl space sometimes dries it out and sometimes makes i...

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