In the 2026 Malaysian commercial landscape, Internal Duct Sealing (specifically Aerosolized Sealing) is the definitive engineering solution for meeting the strict mandates of the Energy Efficiency and Conservation Act (EECA) 2024.
Unlike traditional manual sealing, which requires physical access to the exterior of the ductwork, internal sealing addresses leaks from the inside out. This makes it the only viable method for repairing "hidden" leaks in vertical risers or ducts buried behind fixed plaster ceilings in high-rise offices across Kuala Lumpur and Selangor.
The industry standard for internal sealing is the Aeroseal process. It treats the entire duct network as a single pressure vessel.
System Isolation: All terminal diffusers and grilles are blocked with temporary foam plugs. The AHU (Air Handling Unit) and sensitive components like VAV boxes are bypassed to protect internal electronics.
Pressurization & Baseline Test: A computerized diagnostic fan pressurizes the system to identify the current leakage rate (measured in $L/s$ or $CFM$).
Sealant Injection: A non-toxic, water-based polymer mist is injected into the pressurized air stream. The particles remain suspended in the air until they reach a leak site.
Targeted Bridge Building: As air attempts to escape through a gap, the particles collide with the edges of the leak and bond together, "building" a seal across gaps up to 15mm wide.
Under the EECA 2024, large commercial buildings must maintain a specific Building Energy Index (BEI).
The "Invisible" Penalty: Leaky ducts typically account for 20% to 30% of wasted cooling energy.
Star Rating Impact: Internal sealing can lower a building's BEI by 15 to 25 points, often moving a facility from a 3-Star to a 5-Star Energy Label without the need for expensive chiller upgrades.
Following the 2026 update to MS 1525, ATC 6 is now the benchmark for high-performance buildings. Internal aerosol sealing is the only method capable of verifying that a system has reached $<1\%$ leakage, as the software provides a Certificate of Airtightness with real-time digital proof of the reduction.
Internal sealing ensures that return air ducts are hermetic. This prevents "plenum aspiration"—the suction of dusty, humid air from contaminated ceiling voids. This is essential for passing the mandatory 500 cfu/m³ bacterial ceiling required for healthy Malaysian workspaces.
| Feature | External Manual Sealing | Internal Aerosol Sealing |
| Accessibility | Requires full visual access | No access needed (Internal path) |
| Leak Coverage | 40% – 50% (Visible only) | 95% – 99% (Comprehensive) |
| Demolition Required | High (Ceiling removal) | None (Zero Disruption) |
| Verification | Visual / Smoke test | Computerized Pressure Report |
| Best Used For | Exposed Mechanical Rooms | Hidden Risers & Inaccessible Ducts |
| EECA 2024 Status | Basic / Maintenance | Audit-Grade Compliance |
As your M&E partner, we integrate internal sealing with Total 3D BIM Coordination. We model your duct network in 3D to identify high-resistance "choke points" and optimize the aerosol delivery path.
Digital Audit Trail: We provide the certified data your Registered Energy Manager (REM) needs for mandatory Energy Commission (ST) submissions.
Turnkey TAB Integration: Once sealed, we perform a final Testing, Adjusting, and Balancing (TAB) to ensure that the newly recovered air is distributed precisely to every office zone.
Is your facility's energy efficiency being sabotaged by inaccessible duct leaks? Contact EKG M&E Sdn Bhd today for a professional internal duct sealing audit and secure the performance of your infrastructure.
Expert Guide: Are you planning to treat an existing building to improve its Energy Star Rating, or are you working on the commissioning of a new Grade-A office tower?
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