In the complex mechanical shafts of Kuala Lumpur and Selangor's high-rise buildings, space is a premium. Fire-Rated Sub-Duct Staircase Pressurization refers to a specialized "duct-within-a-shaft" or branch configuration designed to deliver fresh air into escape stairwells while maintaining the integrity of the fire compartments it breaches.
EKG M&E Sdn Bhd provides high-performance sub-duct solutions that ensure your pressurization system remains operational under extreme heat, complying strictly with MS 1472 and BOMBA standards.
A sub-duct is often used when a branch of the pressurization system must pass through a main fire-rated shaft or a separate fire compartment without the use of fire dampers (as fire dampers are generally prohibited in pressurization paths).
Because these sub-ducts carry the air that maintains the 50 Pa (Pascal) pressure shield, they must be protected against external fire exposure for at least 2 hours.
Passive Barrier: We encase the galvanized steel (G.I.) sub-ducts in BOMBA-approved fire-rated boards or high-density mineral wool wraps.
Thermal Insulation: The fire-rating ensures that even if the main shaft or an adjacent room is on fire, the air inside the sub-duct remains cool. This is vital to prevent the "injection" of superheated air into the escape stairwell.
In certain vertical applications, sub-ducts are designed as "shunts."
The Shunt Logic: The sub-duct rises vertically within the main shaft for a specific distance (usually one floor height) before connecting to the main riser.
Smoke Blocking: This physical configuration utilizes the buoyancy of hot gases and the "trap" effect to prevent smoke from a fire floor from migrating into the pressurization stream.
As a BOMBA-Compliant M&E Specialist, EKG ensures your sub-duct infrastructure supports building efficiency:
TNB Energy Efficiency (Hermetic Sealing):
Sub-duct junctions are frequent points of air leakage. By ensuring every sub-duct connection is sealed with certified intumescent gaskets, we eliminate static pressure loss. This allows your Variable Frequency Drive (VFD) to maintain safety standards at lower frequencies (Hz), directly reducing your monthly TNB electricity bill during mandatory weekly testing.
EECA 2024 & Building Compliance:
Under the Energy Efficiency and Conservation Act (EECA) 2024, mechanical air transport must be optimized for minimal waste. Our precision-sealed fire-rated sub-ducts protect your Building Energy Index (BEI).
Space Optimization:
Sub-duct systems often allow for more compact mechanical shafts compared to traditional clad ducting, maximizing the net lettable area (NLA) of your commercial property.
| Feature | Standard Branch Duct | EKG Fire-Rated Sub-Duct |
| Material | 0.5mm – 0.8mm GI | 1.2mm GI + Fire Board/Wrap |
| Fire Resistance | None | Mandatory 2-Hour (FRL 120/120/120) |
| Connection Type | Standard Slip Joint | Liquid-Tight / Intumescent Sealed |
| Fire Dampers | Often Required | Omitted (to ensure airflow) |
| BOMBA Required | No | Mandatory for Life-Safety FC |
Total 3D BIM Coordination: Sub-ducts are located in the most congested parts of a building. We utilize 3D modeling to route these conduits with zero "clashes" against wet risers, standpipes, or structural beams.
Turnkey BOMBA Submission: We provide all technical "Certificate of Conformity" documents and conduct the mandatory Pressure Differential Test required for your Fire Certificate (FC) application.
Strategic Regional Support: Based in Kuala Lumpur, we provide professional sub-duct audits and installations for hospitals, data centers, and luxury high-rises across Malaysia.
Is your staircase pressurization system protected at its most vulnerable points? Contact EKG M&E Sdn Bhd today for a professional fire-rated sub-duct audit and technical proposal.
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