Fan Engineering Guides

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

PSC-to-ECM Blower Motor Retrofit: Fit & Payback
By longwell / September 19, 2026 / Fan Engineering Guides

PSC-to-ECM Blower Motor Retrofit: Fit & Payback

Should you replace an AC or PSC blower motor with an ECM? This enginee...

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High Pressure vs High Volume Blowers
By longwell / September 19, 2026 / Fan Engineering Guides

High Pressure vs High Volume Blowers

Should you choose a high-pressure blower or a high-volume blower? The ...

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Fan Drive Commissioning Checklist: Direct vs Belt Service
By longwell / September 19, 2026 / Fan Engineering Guides

Fan Drive Commissioning Checklist: Direct vs Belt Service

Direct drive or belt drive? This engineering walkthrough compares both...

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Duct Fan Submittal Checklist: Evidence Before Approval
By longwell / September 19, 2026 / Fan Engineering Guides

Duct Fan Submittal Checklist: Evidence Before Approval

“Inline” and “centrifugal” are not opposite fan types. Inline describe...

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OEM Fan vs Off-the-Shelf: When to Customize
By longwell / September 19, 2026 / Fan Engineering Guides

OEM Fan vs Off-the-Shelf: When to Customize

Should an OEM customize a fan, configure an existing platform, or keep...

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ebm-papst / Ziehl-Abegg Alternatives: How to Evaluate
By longwell / September 19, 2026 / Fan Engineering Guides

ebm-papst / Ziehl-Abegg Alternatives: How to Evaluate

Can another EC centrifugal fan replace an ebm-papst or Ziehl-Abegg uni...

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Backward-Curved Fan Noise: A Same-Duty Comparison Guide
By longwell / September 18, 2026 / Fan Engineering Guides

Backward-Curved Fan Noise: A Same-Duty Comparison Guide

Why can a backward-curved centrifugal fan run quieter at the same airf...

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How to Size a Centrifugal Blower (Step by Step)
By longwell / September 18, 2026 / Fan Engineering Guides

How to Size a Centrifugal Blower (Step by Step)

How do you size a centrifugal blower without guessing from maximum air...

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How to Read a Fan Performance Curve to Pick a Fan
By longwell / September 18, 2026 / Fan Engineering Guides

How to Read a Fan Performance Curve to Pick a Fan

How do you use a fan performance curve to select the right fan? This e...

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CFM Calculator: Sizing Airflow for Any Room/Process
By longwell / September 18, 2026 / Fan Engineering Guides

CFM Calculator: Sizing Airflow for Any Room/Process

How much CFM do you actually need? This engineering walkthrough preven...

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