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Practical guides and in-depth articles for HVAC engineers and contractors

GI ductwork and PIR pre-insulated duct runs installed side by side beneath a concrete slab

Duct Types · QCS 2014

GI Duct vs PI-Duct — Complete HVAC Guide 2025

8 min read · January 2025

A complete comparison covering cost, thermal performance, installation speed, fire ratings, and QCS 2014 compliance.

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Motorised damper with an external actuator fitted to a galvanized duct run above a concrete ceiling

Fire Safety · Standards

How to Choose the Right Damper — UL 555 Requirements

6 min read · December 2024

VCD, Motorized VCD, and Fire Smoke Dampers — UL 555 compliance requirements, selection criteria, and installation rules.

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HVAC shop drawings, duct gauge samples and a submittal binder laid out on a site table

Documentation

HVAC Submittal Documents — How to Prepare and Get Approved Fast

5 min read · November 2024

Practical steps to build a first-pass-approved submittal package: data sheets, certificates, shop drawings, and compliance statements.

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Galvanized supply ductwork with access panels, diffusers and cable trays on a building services floor

Regulatory Framework · QCS 2014New

QCS 2014 Explained: HVAC Ductwork & Damper Compliance

10 min read · June 2025

The complete technical guide to Qatar's mandatory HVAC compliance standard — ductwork gauges, leakage testing, damper certification, and QCD approval requirements.

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