Backward Curved Fans

Backward curved impellers trail away from the direction of rotation, giving high efficiency and a non-overloading power curve — the standard choice for AHUs, fan walls, FFUs and data-center air handling. This tag collects design explanations, EC plug fan applications and retrofit cases built on the LONGWELL LWBE3G platform.

plug fan vs housed fan
By longwell / August 24, 2026 / Technical Articles

Plug Fan vs Housed Fan: Energy & Space Savings Comparison

If you want to design an HVAC system, size the AHU, or replace the age...

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

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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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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data center selection
By longwell / June 12, 2026 / Technical Articles

Data Center Fan Selection Guide: How to Choose the Right EC Fan?

Today’s procurement engineer isn’t just selecting an EC backward-curve...

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backward curved centrifugal fan
By longwell / June 10, 2026 / Technical Articles

What is a Backward Curved Centrifugal Fan?

Among the various fan technologies available, centrifugal fans generat...

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Plug Fan vs Housed Centrifugal Fan: Compare the Installed Boundary
By longwell / May 28, 2026 / Fan Engineering Guides

Plug Fan vs Housed Centrifugal Fan: Compare the Installed Boundary

Compare plug and housed centrifugal fans at the same airflow-pressure ...

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what are centrifugal fans
By longwell / May 11, 2026 / Technical Articles

What Are Centrifugal Fans? A Complete Beginner’s Guide

The centrifugal fan is one of the most efficient solutions for moving ...

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How-to-Select-the-Right-Backward-Curved
By longwell / March 23, 2026 / Technical Articles

How to Select the Right Backward Curved Centrifugal Fan: An 8-Step In-Depth Selection Guide & Technical Analysis

How to Select the Right Backward Curved Centrifugal Fan: An 8-Step In-...

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In-Depth-Analysis--Why-Longwell-DC-EC-B
By longwell / March 21, 2026 / Technical Articles

In-Depth Analysis: Why Longwell DC/EC Backward Curved Centrifugal Fans are the Optimal Choice for Efficient Ventilation?

In-Depth Analysis: Why Longwell DC/EC Backward Curved Centrifugal Fans...

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