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Air Tightness Class 6 (ATC 6) Duct Sealing by EKG M&E Sdn Bhd

In the evolving landscape of energy-efficient building standards in KL and Selangor, air leakage is no longer just a maintenance issue—it is a significant financial liability. EKG M&E Sdn Bhd provides specialized Air Tightness Class 6 (ATC 6) Duct Sealing, the highest commercial standard for minimizing air loss within ventilation systems. By adhering to ATC 6 (formerly known as Class C in older standards), we ensure that your HVAC system delivers nearly 100% of its cooling capacity exactly where it is needed.

Engineering Selection by Application

We apply ATC 6 sealing protocols to facilities where pressure integrity and energy conservation are non-negotiable.

1. Green Building & GBI Certified Projects

For buildings aiming for high sustainability ratings, every watt of fan energy counts.

• Leakage Reduction: ATC 6 standards allow for significantly less leakage than standard Class 4 or 5 systems. This ensures the building meets the strict energy-saving criteria required for GBI or LEED certification.

• Fan Energy Optimization: By sealing to ATC 6, the primary AHU can run at lower speeds while still achieving the required air changes, directly lowering TNB electricity bills.

2. High-Pressure Industrial Extraction

In industrial zones, high-static pressure fans can "force" air out of even the smallest gaps.

• System Stability: We utilize reinforced joint sealing to ensure that the ductwork maintains its structural and airtight integrity under high-velocity air movement.

• Toxic Fume Containment: For chemical or laboratory extraction, ATC 6 sealing ensures that 100% of the contaminated air is safely transported to the filtration units without escaping into the ceiling plenum.

3. Data Centers and Precision Cooling

Data centers require a perfectly balanced "Cold Aisle" environment where air pressure must be precisely maintained.

• Static Pressure Retention: ATC 6 sealing prevents "short-circuiting" of cold air, ensuring that the pressurized floor or ceiling voids maintain the exact airflow needed to cool sensitive server racks.

Critical Installation and Integration

Achieving ATC 6 requires a level of precision that goes beyond standard duct installation:

Multi-Stage Sealing Protocol:

We don't just seal the outside. Our team applies high-velocity grade duct sealant to the internal seams during fabrication and a secondary industrial-grade polymer sealant to the external flange joints (TDF/TDC) during on-site assembly.

Precision Gasketing and Flange Torque:

Standard foam tapes are insufficient for ATC 6. We utilize 5mm to 10mm thick neoprene or butyl rubber gaskets between all flange connections. Every bolt is torqued to a specific sequence to ensure even pressure across the entire seal, eliminating the risk of "whistling" or micro-leaks.

Duct Leakage Testing (DW/143 Standards):

To prove compliance, we don't just visual inspect. We perform Ductwork Leakage Testing using calibrated pressure machines. We pressurize a section of the ductwork and measure the exact leakage rate against the ATC 6 allowable limits, providing a certified report for your M&E consultants.

Performance and Durability Matrix

Feature	Standard Class 4 (ATC 4)	EKG M&E ATC 6 Sealing
Allowable Leakage	Baseline Standard	3x More Airtight than ATC 4
Joint Technology	Basic slip-on / Tape	TDF Flange / Neoprene Gaskets
Sealant Grade	Standard Acrylic	High-Velocity Polymer (Anti-Fungal)
Pressure Rating	Up to 500 Pa	Tested up to 2000 Pa
Energy Impact	Moderate Loss	Maximum Efficiency

Why Choose EKG M&E Sdn Bhd?

• Certified Compliance: We provide the technical rigor required to pass the most stringent M&E inspections. Our "Zero-Whistle" guarantee ensures your ductwork is as silent as it is efficient.

• Advanced Material Selection: We only use low-VOC, fire-rated sealants that are designed for the high-humidity Malaysian climate, preventing the sealant from drying out or cracking over time.

• Specialized KL Support: Based in Kuala Lumpur, we offer specialized retro-sealing for existing buildings that are failing their air-balance audits, helping facility managers reclaim lost cooling capacity.