AHU Ducting & Terminal Connection Setup: Flexible Duct Connection

In the 2026 Malaysian engineering landscape, the Flexible Duct Connection serves as the final "soft link" between the rigid secondary ductwork and the terminal device (such as a Ceiling Air Diffuser or VAV box). Under MS 1525:2024 and SMACNA 2026 standards, this connection is critical for isolating mechanical noise and allowing for precision alignment in congested ceiling voids.

At EKG (Malaysia) SDN BHD, we engineer flexible connections to be Sterile, Silent, and Statutory-Compliant, ensuring they do not become a source of energy-wasting friction or acoustic distress.

1. The Statutory Framework: EECA 2024 & Thermal Integrity

Since the enforcement of the Energy Efficiency and Conservation Act (EECA) 2024, flexible ducts are no longer treated as "disposable" components. They must meet strict thermal and leakage benchmarks.

• Insulation Standards (R-6.0): In Malaysia's high-humidity climate, flexible ducts must be pre-insulated with a minimum of 25mm to 50mm of high-density fiberglass or elastomeric foam. This prevents "sweating" and ensures that the air cooled by the VFD-driven AHU reaches the room at the design temperature.

• Vapor Barrier Integrity: The outer jacket (usually a reinforced aluminum foil) must be 100% airtight. Any puncture leads to moisture ingress, which destroys the insulation's R-value and contributes to "Energy Waste."

• GITA Compliance: Systems utilizing low-friction, high-R-value flexible connections are eligible for the 100% Green Investment Tax Allowance (GITA).

2. Engineering for Low Static Pressure

The most common cause of high Specific Fan Power (SFP) in Malaysian buildings is poorly installed flexible ducting. EKG adheres to the "Short & Straight" protocol:

3. Acoustic Performance: NC 30-35

Flexible ducts act as a secondary "muffler." By decoupling the rigid metal duct from the diffuser, they prevent the transmission of mechanical vibration into the occupied zone.

1. Vibration Isolation: The flexible core absorbs the minor pulsations from the VFD-driven AHU, ensuring executive areas maintain a Noise Criteria (NC) of 30 to 35.

2. Velocity Control: We size the flexible connection for a maximum velocity of 3.5 m/s. If the air moves too fast through the ribbed internal core of a flex duct, it generates a turbulent "whistle" that is a common cause of occupant complaints.

4. The "Fire Mode" Statutory Protocol

Flexible duct connections must comply with BOMBA (JBPM) 2026 fire safety standards, especially regarding smoke toxicity and flame spread.

• Class 0 / Class 1 Certification: All flexible ducts used by EKG are certified for "Zero Flame Spread" and "Low Smoke Emission." They must not contribute to the fire load within the ceiling void.

• Fire Damper Proximity: Flexible ducts must never penetrate a fire-rated wall or floor. They must always terminate at a rigid duct sleeve that contains a Motorized Fire Damper (MFD).

• BOMBA Audit: JBPM officers will physically inspect the fire-rating labels on flexible ducts during the annual Fire Certificate (FC) witness test.

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

• Technical Integrity: Our installations are led by mechanical specialists who ensure that flex ducts are not "kinked" or "crushed" by other services like fire sprinklers or cable trays.

• BIM-Coordinated Integration: We use 3D modeling to coordinate the exact exit point of the rigid duct, ensuring the flexible connection remains as short and straight as possible.

• EECA Compliance Support: We provide the "System Integrity Reports" required by your Registered Energy Manager (REM) to prove that the terminal connections are optimized for the lowest energy footprint.

Is your flexible ducting causing drafts, noise, or high energy bills?

Contact EKG (Malaysia) SDN BHD today for a specialized Terminal Connection & Airflow Efficiency Audit.