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.

LWBE3G450-188NT-21-00
By longwell / July 15, 2026 / Engineering Case Studies

LWBE3G450-188NT-21-00 EC Centrifugal Fan for AHUs

An OEM required a high-pressure EC centrifugal fan for a new AHU desig...

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metal duct fan vs plastic
By longwell / July 10, 2026 / Technical Articles

Metal vs Plastic Duct Fan: Which is Better for Industrial Use?

In industrial ventilation systems, ducts are usually quite long, and s...

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LONGWELL DUCT FAN
By longwell / July 9, 2026 / Technical Articles

How to Increase Airflow in Ductwork?

When talking about HVAC, air conditioning is mostly considered. Howeve...

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LONGWELL double inlet centrifugal fan
By longwell / July 2, 2026 / Technical Articles

Single Inlet vs Double Inlet Centrifugal Fan: When to Use Each?

In industrial ventilation and HVAC systems, centrifugal fans serve as ...

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LWAA4D350S-5MKB-22-00
By longwell / June 26, 2026 / Engineering Case Studies

LWAA4D350S-5MKB-22-00 380V AC Axial Fan for HVAC Condensers

An OEM required a 380V 60Hz AC axial fan for a new line of HVAC conden...

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customized impeller
By longwell / June 24, 2026 / Engineering Case Studies

LWPI-Φ107X762-01 Cross-Flow Fan Impeller for HVAC OEM

A commercial HVAC OEM required a 762mm x 107mm drop-in replacement cro...

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Longwell centrifugal fan
By longwell / June 24, 2026 / Technical Articles

7 Effective Ways to Reduce Centrifugal Fan Noise

Centrifugal fans are widely used in various commercial and industrial ...

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axial fan blade
By longwell / June 24, 2026 / Engineering Case Studies

406-522mm LWA Series Axial Fan Blades for HVAC Condenser Units

An HVAC OEM required a portfolio of four robust axial fan blades (406m...

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lwfa e 250 01 forward curved centrifugal fan
By longwell / June 23, 2026 / Engineering Case Studies

LWFA-E-250-01 Forward-Curved Centrifugal Fan for HVAC Air Handlers

An OEM required a 220V AC centrifugal fan for a commercial air conditi...

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direct drive fan vs belt drive fan
By longwell / June 4, 2026 / Technical Articles

Direct Drive vs Belt Drive Fan: Performance Comparison Guide

Industrial fans play an important role in HVAC systems, warehouses, da...

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