The Qatar Construction Specifications (QCS 2024) is the mandatory regulatory framework enforced by Qatar's Ministry of Municipality and Environment governing all building construction, mechanical installation, and building services across the State of Qatar. For HVAC contractors, consultants, and suppliers operating in Qatar, QCS 2024 is not optional guidance — it is the legally binding compliance baseline against which every ductwork system, damper assembly, and mechanical installation is evaluated. Understanding its requirements is the difference between swift consultant approval and costly re-submission cycles.
What QCS 2024 Section 22, Part 06 covers
Section 22 of QCS 2024 (Air Conditioning, Refrigeration and Ventilation) covers HVAC systems in Qatar. Its Part 06, Ductwork and Air-Side Equipment, sets the requirements for ductwork materials, fabrication, support and installation, with reference to ASHRAE, SMACNA and DW 144 practice. The clauses below are the ones reproduced in the WellWall phenolic duct QCS 2024 compliance statement (clauses 6.2.1 to 6.2.5).
| Clause | Topic | What it requires | How Tawreed complies |
|---|---|---|---|
| 6.2.1 | Ductwork material | All ductwork except in laboratories, kitchens and laundry extract systems is made from strip-mill, cold-reduced sheet, continuously hot-dip galvanized to BS 2989 grade Z2, unless specified otherwise in the project documentation. Flanges and stiffeners are galvanized steel sections; flexible ductwork conforms to BS 1470 and is limited to 2 m per section. | GI duct: galvanized steel, minimum zinc coating 275 g/m² (BS EN 10346). PI duct: used where the project specification calls for it; WellWall panels and accessories with aluminium profiles in place of galvanized flanges; sections up to 4 m long. |
| 6.2.2 | Ductwork specification | Fabrication and hanging methods follow the Equipment volume of the ASHRAE Guide and Data Book and/or the applicable SMACNA manuals; contractors familiar with British Standards may refer to BS CP 352 and DW 144. | GI duct fabricated to SMACNA and QCS 2024 Section 22. |
| 6.2.3 | Ductwork general | Dimensions are checked on site before manufacture, the installation is carried out by an approved ductwork specialist, ductwork is rigidly supported from the building structure on hot-dip galvanized supports, and sealants, gaskets and tapes follow DW 144 or DW 151. | PI duct: transverse joints use an aluminium invisible flange with a PVC H bayonet; joints are sealed with acrylic sealant, with no gasket required. |
| 6.2.4 | Low-pressure ductwork | Ductwork with mean velocities below 10 m/s and static pressures of 500 Pa or less. Rectangular low-pressure duct is made from galvanized steel sheet, with reinforcing and joints to the ASHRAE Guide or DW 144. | GI duct datasheet: SMACNA gauge and joint tables for the 500 Pa pressure class. |
| 6.2.5 | Medium-pressure ductwork | Ductwork subject to pressures up to 1000 Pa. Rectangular medium-pressure duct is made from galvanized steel sheet as specified in DW 144, with reinforcement and joints to DW 144. | GI duct datasheet: SMACNA gauge and joint tables for the 1000 Pa pressure class. |
How Tawreed GI and PI duct comply
GI duct
- Fabricated to SMACNA and QCS 2024 Section 22
- Galvanized steel with a minimum zinc coating of 275 g/m² (BS EN 10346)
- TDF flanges and Pittsburgh lock seams
- Datasheet: SMACNA gauge and joint tables for the 500 Pa, 750 Pa and 1000 Pa pressure classes, which cover the low-pressure (500 Pa) and medium-pressure (1000 Pa) ranges of clauses 6.2.4 and 6.2.5
- A QCS 2024 compliance statement for GI duct is available on request
Pre-insulated (PI) duct
- The WellWall phenolic duct QCS 2024 compliance statement answers clauses 6.2.1 to 6.2.5 one by one
- WellWall phenolic duct board: λ 0.021 W/(m·K) and UL 181 Class 1 air duct (UL file MH63347)
- Fabricated from WellWall panels and their accessories, with aluminium profiles in place of galvanized flanges
- Sections up to 4 m long; transverse joints with an aluminium invisible flange and a PVC H bayonet
- Joints sealed with acrylic sealant, with no gasket required
- Clause 6.2.1 makes galvanized sheet the default unless the project documentation specifies otherwise, so PI duct is used where the project specification calls for it
Dampers under QCS 2024
Tawreed supplies UL 555 fire dampers rated 1.5 and 3 hours, together with volume control, motorised, non-return and pressure relief dampers.
Volume control dampers
Heavy-gauge galvanized iron volume control dampers for commercial and industrial HVAC.
Motorised dampers
Electrically actuated multi-blade dampers for BMS-controlled HVAC systems.
Non-return dampers
Gravity or spring-operated back-draft dampers to prevent reverse airflow.
Pressure relief dampers
Spring-loaded relief dampers for over-pressure protection in pressurized spaces.
Tawreed Trading: your QCS 2024 compliance partner
Every product in the Tawreed Trading portfolio is sourced, tested, and documented to satisfy the full compliance requirements of QCS 2024 Section 22 — from GI duct sheet gauges and SMACNA-compliant fabrication through to UL 555-listed fire dampers carrying active Qatar Civil Defence registration. This means that when a contractor submits a product package sourced from Tawreed, it arrives with all the documentation layers already assembled: manufacturer data sheets, current test certificates, QCD approval letters, and BMS integration specifications.
For MEP consultants, this translates directly into faster first-pass approval rates. For contractors, it eliminates the procurement risk of sourcing a product that fails at the submittal stage or — worse — fails a site inspection after installation. QCS 2024 compliance is not a checkbox: it is the foundation of every project delivery in Qatar.
How to request documents
Send your BOQ or project details
Send your BOQ through the quote form for a formal quotation within 4 business hours.
Choose the documents
QCS 2024 compliance statements, Civil Defence registration documents, datasheets or a full submittal package.
Receive the package
Request them through the submittal page; submittal packages are typically turned around within 4 business hours.