HVAC Systems

Fans are among the largest energy consumers inside HVAC systems — in AHUs, fan coils, fresh-air units and terminal ventilation. Articles here map fan roles across HVAC equipment, compare fan types per application and quantify the savings from demand-based control.

Plenum fan mounted on a bulkhead inside an air handling unit
By longwell / August 21, 2026 / Fan Engineering Guides

Plenum (Plug) Fan vs Housed Fan for AHU

A plenum fan blows into the cabinet rather than into a scroll. That co...

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5-Mistakes-When-Importing-HVAC
By longwell / August 20, 2026 / Fan Engineering Guides

5 Mistakes to Avoid When Importing HVAC Fans

5 HVAC Fan Import Mistakes That Cost Buyers | Evidence Checklist - Imp...

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LONGWELL centrifugal fan
By longwell / August 11, 2026 / News

Centrifugal HVAC Fans: Complete Ordering Guide

Centrifugal fans are widely used in AHUs, ventilation equipment, and H...

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LONGWELL RLM series commercial centrifugal plug fan
By longwell / August 10, 2026 / Engineering Cases

RLM series Commercial Centrifugal Plug Fans for HVAC OEM

Delivering 700 Pa static pressure and up to 9000 m³/h airflow, these c...

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LONGWELL factory
By longwell / July 31, 2026 / News

Fans for HVAC OEM: How to Build Long-Term Supply Partnerships?

In HVAC systems, fans are one of the most crucial components. Differen...

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LWFE3G200-102SS-02-00
By longwell / July 27, 2026 / Engineering Cases

LWFE3G200-102SS-02-00 EC Centrifugal Fan for HVAC

An OEM required a 200mm EC centrifugal fan delivering 700 m³/h at 1000...

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LWAA4E550S-5MEB-02 axial fan
By longwell / July 27, 2026 / Engineering Cases

LWAA4E550S-5MEB-02 AC Axial Fan for HVAC Condensers

Case study on an 8,755 m³/h AC axial fan for HVAC condenser units. See...

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By longwell / July 25, 2026 / Engineering Cases

230V AC Cross Flow Fan with 1000W PTC Heater for HVAC Modules: 115 m³/h Case Study

A compact 230V AC cross flow fan delivering 115 m³/h of airflow across...

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LWBA for AHU cases
By longwell / July 25, 2026 / Engineering Cases

380V AC Centrifugal Fan for AHUs: 695 Pa High-Pressure

Developing a standardized 380V AC backward curved centrifugal fan for ...

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LONGWELL EC motors
By longwell / July 18, 2026 / News

EC Motor Efficiency Explained for HVAC Systems

Electric motors served as the driving components of HVAC systems. Thei...

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