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...

Read More »
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...

Read More »
LONGWELL centrifugal fan
By longwell / August 11, 2026 / Technical Articles

Centrifugal HVAC Fans: Complete Ordering Guide

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

Read More »
Backward-curved centrifugal fan with a metal impeller
By longwell / August 10, 2026 / Engineering Case Studies

RLM Series Commercial Centrifugal Plug Fan Selection and Designation

LONGWELL engineering selection report for RLM series commercial centri...

Read More »
LONGWELL factory
By longwell / July 31, 2026 / Technical Articles

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

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

Read More »
Forward-curved centrifugal blower in a scroll housing
By longwell / July 27, 2026 / Engineering Case Studies

LONGWELL 200mm EC Forward-Curved Centrifugal Fan Specification

LONGWELL standard specification for 200mm EC forward-curved centrifuga...

Read More »
Axial fan with a circular wire guard and metal blades
By longwell / July 27, 2026 / Engineering Case Studies

Specification Sheet Issued for LONGWELL LWAA4E550S-5MEB-02-00 AC Axial Fan

Technical specification compiled for the LONGWELL LWAA4E550S-5MEB-02-0...

Read More »
Backward-curved centrifugal fan with a metal impeller
By longwell / July 25, 2026 / Engineering Case Studies

LONGWELL LWBA2D225 and LWBA2D250 AC Backward Curved Centrifugal Fan Specification

Technical specification comparison for LONGWELL LWBA2D225-092NT-11-00 ...

Read More »
LONGWELL EC motors
By longwell / July 18, 2026 / Technical Articles

EC Motor Efficiency Explained for HVAC Systems

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

Read More »
centrifugal fan maintenance
By longwell / July 17, 2026 / Technical Articles

Centrifugal Fan Maintenance: Annual Inspection Checklist & Tips

Centrifugal fans serve as the heart of ventilation systems, providing ...

Read More »