100% Fresh Air Hospital AHU Systems

Cleanroom & Hospital Grade AHU Specifications: 100% Fresh Air Systems

In the mission-critical environment of healthcare, 100% Fresh Air Hospital AHU Systems are designed to prevent the recirculation of airborne pathogens and contaminants. Unlike standard commercial units, these systems operate on a "Once-Through" principle, where every cubic meter of air delivered to the space is fresh, filtered, and then exhausted, ensuring maximum Infection Control.

At EKG (Malaysia) SDN BHD, we engineer these systems to meet the dual challenges of Ministry of Health (MOH) Malaysia standards and the energy efficiency mandates of EECA 2024.

1. The "Once-Through" Path Architecture

The defining characteristic of a hospital-grade AHU is the total absence of a return air mixing plenum.

• Zero Recirculation: 100% of the air is drawn from the outdoors. This eliminates the risk of cross-contamination between different hospital wards or surgical theaters.

• Pressure Regime Control: The layout is engineered to maintain precise pressure gradients. Operating theaters are kept at Positive Pressure to keep contaminants out, while isolation wards are kept at Negative Pressure to keep pathogens in.

• Exhaust Air Treatment: Because the air is not recirculated, the exhaust stream often contains infectious material. We integrate HEPA-filtered exhaust modules to ensure the air released back into the environment is sterile.

2. Multi-Stage Clinical Filtration

Hospital-grade systems utilize a rigorous filtration sequence to ensure "surgical-grade" air purity.

• Pre-Filtration (G4/F7): Primary filters capture large particles and protect the high-efficiency components downstream.

• Secondary Filtration (F9): This stage removes fine dust and larger microbes.

• Final Stage (H13/H14 HEPA): Positioned at the AHU discharge or at the room terminal, HEPA filters achieve 99.97% to 99.99% efficiency in removing particles down to 0.3 microns, including bacteria and viral carriers.

3. Thermal Management for High Load

Treating 100% outdoor air in Malaysia's tropical climate is energy-intensive. EKG utilizes specialized components to manage this load while maintaining a Low BEI.

• Run-Around Coil Loops: Unlike an enthalpy wheel (which carries a minor risk of cross-contamination), a run-around loop uses a closed-circuit water/glycol pipe to transfer "coolth" from the exhaust air to the incoming fresh air. This provides 100% isolation between air streams while recovering up to 20% of the cooling energy.

• Double Cooling Coils: To handle the extreme latent heat (humidity) of Malaysian air, we often utilize a two-stage cooling layout: a Pre-Cooling Coil followed by a Main Cooling Coil for precise de-humidification.

4. Technical Comparison: Standard vs. Hospital Grade AHU

5. Hygiene-First Engineering (TB2 & SUS)

Hospital AHUs must be biologically inert. Any moisture buildup within the unit can become a breeding ground for mold.

• TB2 Thermal Breaks: Our double-skin casing with TB2 thermal breaks is mandatory here. It prevents casing condensation ("sweating") that would otherwise lead to corrosion and microbial growth.

• Sloped Stainless Steel Drain Pans: We utilize SUS 304/316 drain pans with a deep-seal "U-trap" and multi-directional sloping to ensure every drop of condensate is evacuated immediately, preventing stagnant water.

• Internal Lighting & Viewing Ports: Modern hospital AHUs include pressure-rated viewing ports and internal LED lighting, allowing technicians to inspect the cleanliness of coils and filters without opening the unit and breaking the sterile seal.

Why Partner with EKG (Malaysia) SDN BHD?

• Technical Integrity: We provide the SFP and Psychrometric Data required for hospital accreditation and EECA 2024 energy audits.

• Cleanroom Standards: Our units are designed to meet ISO 14644 cleanroom standards, essential for surgical theaters and pharmaceutical labs.

• BOMBA-Compliant Safety: All clinical-grade insulation and seals are non-shredding and fire-rated (Class 0 or B1).

Is your healthcare facility's HVAC system compliant with 2026 infection control and energy standards? Contact EKG (Malaysia) SDN BHD today. We specialize in engineering 100% Fresh Air systems that are sterile, silent, and ultra-efficient.