In the 2026 engineering environment, Double-Skin AHU Field Assembly is a specialized procedure used when logistical constraints—such as narrow service lifts or tight corridors in established KL high-rises—prevent the delivery of a fully assembled unit. Under the Energy Efficiency and Conservation Act (EECA) 2024, a field-assembled unit must meet the same rigorous airtightness and thermal performance standards as a factory-built model to protect the building's Energy Intensity Label.
At EKG (Malaysia) SDN BHD, we utilize a "Modular-First" assembly protocol, ensuring that every panel and component is integrated with precision to maintain a sterile, silent, and ultra-efficient environment.
The "Double-Skin" design is the primary defense against thermal leakage and noise.
Thermal Break Construction: We utilize TB2-rated thermal breaks. By decoupling the internal and external skins with a non-conductive material, we prevent "sweating" on the unit's exterior—a critical factor in preventing mold and maintaining DOSH (JKKP) hygiene standards.
High-Density Insulation: Panels are injected with $50\text{--}90\text{ mm}$ of high-density, fire-rated polyurethane foam. This provides the acoustic damping necessary for a "Silent" office environment (typically NC 30-35) and ensures a low thermal transmittance ($U$-value).
Hygienic Internal Skin: The inner skin is typically made of SUS 304 stainless steel or galvanized steel with an antimicrobial coating, featuring coved corners to eliminate microbial "dead zones."
Field assembly requires a controlled environment and a "First-Time-Right" mechanical approach.
Base Frame Leveling: The assembly starts with the installation and laser-leveling of the structural base frame on inertia pads or concrete plinths. This ensures the unit remains balanced and prevents stress on the IE5 Fan Wall.
Modular Component Placement: Internal components—including the cooling coils, Total Enthalpy Recovery Wheel, and fan modules—are positioned onto the base frame according to the LOD 400 BIM layout.
Panel Integration: The double-skin panels are fitted into the framework. We use high-integrity "tongue-and-groove" joints and EPDM gaskets to ensure an airtight seal.
Sterile Sealing: All internal joints are sealed with pharmaceutical-grade, anti-fungal sealants to ensure the AHU remains a sterile source of air for the building.
A field-assembled unit is only as good as its final verification. We perform onsite testing to prove the unit meets its design intent.
| Verification Test | Engineering Benchmark | Purpose |
| Casing Leakage (DW/143) | Class L1 or L2 | Ensures no "energy theft" or unfiltered air bypass. |
| Thermal Bridging Test | No condensation at $25^\circ\text$ / 90% RH | Prevents "Sick Building Syndrome" in humid KL air. |
| SFP Verification | $< 1.1\text{ kW/m}^3\text{/s}$ | Mandatory for the Energy Commission (ST) audit. |
| Acoustic Mapping | Verified NC levels | Guarantees a silent, premium indoor environment. |
Technical Integrity: Our field assembly teams are led by mechanical engineers, ensuring that thermodynamics and airtightness are prioritized over speed.
Zero-Clash Logistics: We coordinate the "break-down" of the AHU into manageable modules in the virtual world, ensuring they fit through your facility’s specific "path of entry."
Digital Handover: Every field-assembled unit is delivered with a Digital Twin containing the "As-Built" assembly records, providing an auditable trail for your 5-year periodic energy audit.
Does your facility require a custom AHU assembly in a restricted space? Contact EKG (Malaysia) SDN BHD today. We specialize in Double-Skin AHU Field Assembly and advanced mechanical coordination.
Would you like to review the specific "Path of Entry" requirements for your mechanical room to see if a modular field assembly is the best solution for your upgrade?
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