Month: September 2026

Testing a fan run capacitor with a multimeter on the capacitance range
By longwell / September 9, 2026 / Fan Engineering Guides

How to Test & Replace a Fan Run Capacitor

A weak run capacitor causes slow starting, low speed and overheating, ...

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Centrifugal-Fan-for-Air-Handling-Units-
By longwell / September 9, 2026 / Technical Articles

Centrifugal Fan for Air Handling Units (AHU): Performance Parameters

In modern HVAC systems, air handling units (AHUs) are responsible for ...

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Single-phase and three-phase fan motors side by side on a bench
By longwell / September 8, 2026 / Fan Engineering Guides

Single-Phase vs Three-Phase Fan Motors

Above about 3 kW the choice makes itself, and below 1 kW it usually do...

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Fitting a VFD on any fan starts with checking the motor nameplate
By longwell / September 8, 2026 / Fan Engineering Guides

Can You Put a VFD on Any Fan?

A drive will spin almost any induction motor, though that is not the s...

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Wiring a fan speed controller to a single phase motor terminal block
By longwell / September 8, 2026 / Fan Engineering Guides

Wiring a Fan Speed Controller (Step by Step)

Speed controllers are not interchangeable, and fitting the wrong type ...

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Soft starter and VFD panel controlling a large industrial fan
By longwell / September 8, 2026 / Fan Engineering Guides

Soft Starter vs VFD vs DOL for Big Fans

Large fan wheels have serious inertia, so how you start them matters. ...

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Ball bearings and sleeve bearings from fan motors compared
By longwell / September 8, 2026 / Fan Engineering Guides

Ball vs Sleeve Bearings: When to Replace

Sleeve bearings are quiet and cheap until they dry out. Ball bearings ...

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Thermal overload protector inside a fan motor winding
By longwell / September 8, 2026 / Fan Engineering Guides

Fan Thermal Overload Protection Explained

A tripping thermal protector is doing its job, and it is also telling ...

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Fan motor nameplate showing voltage, current and insulation class
By longwell / September 8, 2026 / Fan Engineering Guides

How to Read a Fan / Motor Nameplate

A nameplate contains everything you need to order a replacement and di...

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How to reverse a fan motor by swapping two supply leads at the terminal
By longwell / September 8, 2026 / Fan Engineering Guides

How to Reverse a Fan Motor’s Direction

Reversing rotation is straightforward on some motors and impossible on...

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