Smoke Extraction AHU System Design: Statutory Standards 2026

In the 2026 Malaysian engineering landscape, Smoke Extraction AHU System Design (commonly referred to as Smoke Spill Systems) is governed by the Uniform Building By-Laws (UBBL) 2026 and MS 1780:2017/2026. These systems are specialized life-safety assets designed to remove smoke from fire zones—such as large open-plan offices, malls, or basements—to maintain tenable conditions for evacuation.

At EKG (Malaysia) SDN BHD, we design these systems to be Sterile, Silent, and Statutory-Compliant, ensuring they function as high-performance extraction units during an emergency.

1. The Design Mandate: Extraction vs. Purging

As of February 3, 2026, JBPM (BOMBA) requires a clear distinction in the design phase between systems intended for active fire fighting and those for post-fire cleanup.

Extraction Rate: Under MS 1780, a smoke extraction system must provide a minimum of 10 Air Changes Per Hour (ACH) for the largest fire compartment it serves.
Temperature Rating: The entire air path—including the fan, motor, and casing—must be certified to operate at 250°C for a minimum of 120 minutes (FRP 120).
Pressure Management: The design must ensure that the extraction does not create a pressure differential so high that occupants cannot open exit doors (typically limited to 110N of force).

2. Core Engineering Components

A Smoke Extraction AHU differs significantly from a standard cooling unit in its materiality and fail-safe logic.

Component	2026 Engineering Standard	Purpose
High-Temp Motor	Class H Insulation / IP55	Ensures the fan continues to run even as the ambient air reaches 250°C.
Fire-Rated Ducting	MS 2586:2026 (1.2mm min)	Prevents duct collapse and ensures smoke is vented safely out of the building.
VFD "Fire Mode"	Hard-wired Override	Bypasses all internal thermal protection to keep the fan running until structural failure.
Fire Dampers	MS 558:2024 Certified	Note: Traditional fire dampers are typically omitted in smoke spill paths to prevent accidental closure during extraction.

3. Functional Design Sequence (The "Kill-Signal" Protocol)

The integration with the Fire Alarm Monitoring System (FAMS) is the most critical aspect of the design:

Detection: A signal is received from the building's fire panel or localized Duct Smoke Detectors.
Comfort AC Shutdown: All standard AHUs receive an Automatic Fire Signal AHU Shut-off to stop the spread of smoke.
Extraction Initiation: The Smoke Extraction fan ramps up to 100% capacity within 60 seconds.
Make-Up Air Interlock: Motorized fresh air louvers or dedicated make-up air fans must activate to replace the extracted air, preventing a vacuum effect.

4. Statutory Commissioning & AHU Safety Permit

To finalize the design, EKG engineers coordinate the official witness test with BOMBA:

Smoke visualization Test: Using non-toxic smoke bombs to verify the effective extraction path and ensure no "dead zones" where smoke could accumulate.
Static Pressure Audit: Verification that the fan can overcome the resistance of fire-rated ducting and high-temperature louvers.
Digital Twin Handover (LOD 500): Design parameters and commissioning logs are uploaded to the building’s Digital Birth Certificate for the 5-year periodic statutory audit.

5. Why Partner with EKG (Malaysia) SDN BHD?

Technical Integrity: Our designs are led by mechanical specialists who understand the complex relationship between thermodynamics, fluid dynamics, and active fire protection.
EECA 2024 Alignment: We utilize high-efficiency axial or centrifugal fans that meet energy benchmarks during non-emergency "Air Purge" cycles.
GITA Support: Documented compliance with 2026 BOMBA standards is essential for claiming the 100% Green Investment Tax Allowance.

Is your smoke extraction system a life-safety asset or a statutory liability? Contact EKG (Malaysia) SDN BHD today for a specialized Statutory Smoke Extraction System Design Review.

View more about Smoke Extraction AHU System Design on main site