ISO Class 5 Cleanroom AHU Specifications

In the 2026 industrial landscape, ISO Class 5 (Class 100) represents the "Aseptic Frontier." Under the Energy Efficiency and Conservation Act (EECA) 2024, designing an AHU for this level of cleanliness in Malaysia requires a sophisticated balance between high-velocity unidirectional (laminar) airflow and ultra-low Specific Fan Power (SFP).

At EKG (Malaysia) SDN BHD, we engineer ISO Class 5 systems that exceed ISO 14644-1 requirements while maintaining the star-rated efficiency needed for statutory energy audits.

1. The ISO Class 5 Performance Baseline

An ISO Class 5 AHU must maintain a particle concentration of $\le$ 3,520 particles per $m^3$ for particles $\ge 0.5\ \mu m$. Achieving this requires a "piston-like" air movement that washes the room of contaminants.

• Unidirectional Airflow (Laminar): Air must move in parallel streams from ceiling to floor at a uniform velocity of 0.3 m/s to 0.5 m/s (60–100 fpm).

   

• Air Change Rates (ACR): Typical ISO 5 environments require 240 to 480 Air Changes per Hour. This ensures the entire room volume is refreshed every 7 to 15 seconds.

   

• Ceiling Coverage: To achieve laminar flow, 35% to 70% (and often up to 80% for high-spec labs) of the ceiling must be covered with H14 HEPA or U15 ULPA filters.

   

2. AHU Engineering Specifications for 2026

To manage the high static pressure ($1,000\text{--}2,500\ Pa$) of dense filter banks, the AHU must be a precision-engineered machine.

3. Filtration & Air Treatment Hierarchy

Cleanliness at this level is achieved through a multi-stage "Sieve" and active neutralization.

1. Stage 1 (Pre-filter G4/F7): Captures large particles to extend the life of clinical filters.

2. Stage 2 (F9/E10): Removes fine dust and protects the cooling coil from bio-fouling.

3. Stage 3 (H14 HEPA / U15 ULPA): Final terminal stage achieving 99.999% efficiency at 0.3 or 0.12 microns.

4. UV-C Germicidal (UVGI): Integrated 254nm lamps sanitize the coil surfaces, ensuring zero microbial "seeding" of the cleanroom.

4. Precision Environmental Control

ISO 5 processes (like semiconductor lithography or aseptic filling) are hypersensitive to drift.

• Temperature Tolerance: We engineer for $\pm 0.1^{\circ}C$ stability using fast-acting electronic reheat and chilled water modulation.

• Humidity Precision: Target 45% – 55% RH with $\pm 2\%$ control using desiccant cooling or precision steam humidification, critical for preventing static electricity or material degradation.

• Vibration Control: For nanotechnology applications, the fan array is mounted on inertia bases with spring isolators to ensure zero mechanical vibration reaches the work zone.

5. Compliance & Validation (2026 Audit Readiness)

In Malaysia, ISO 5 facilities face mandatory 6-month re-certification cycles.

• In-Situ Testing: Every EKG unit includes built-in DOP/PAO test ports for filter leak scanning without breaking the room’s integrity.

• EnMS Integrated Reporting: All environmental data (Particulate, $\Delta P$, Temp, $kW$) is fed into your Energy Management System (EnMS) for the Energy Commission's statutory audits.

• BOMBA Fire Safety: All internal insulation and gaskets are non-shredding and Class 0 / B1 fire-rated.

Why Partner with EKG (Malaysia) SDN BHD?

• Technical Integrity: We provide the full Validation Package (IQ/OQ) and performance mapping required for NPRA/FDA or semiconductor industry audits.

• 3D BIM Coordination: We resolve complex "High-Bay" ceiling clashes before they reach the site, ensuring the laminar flow path is never obstructed by other services.

Are your ISO 5 air change rates driving your energy costs too high for the 2026 audit? Contact EKG (Malaysia) SDN BHD today. We specialize in engineering high-purity systems that are sterile, silent, and ultra-efficient.