AHU for Hospital Operating Room

Operating Room AHU is a high-grade fresh air handling unit designed for hospital surgical environments, meeting strict hygiene, cleanliness, temperature & humidity stability, bacteria isolation, and pressurization requirements.

Main Functional Sections & Filtration Grade

Filtration is the core of hospital OR AHU:

Pre-filter: G4 / F5

Medium filter: F8 / F9

High-efficiency filter: H13 / H14 (terminal HEPA at supply air outlet)

Optional: UV sterilization, photocatalytic disinfection, antibacterial coating

Critical Technical Requirements

1.1 Air Change Rate

General surgery: 15–25 ACH

Laminar flow ultra-clean OR: 30–60 ACH

1.2 Temperature & Humidity Control

Temperature: 22–26 °C (adjustable ±0.5°C)

Relative humidity: 40%–60% RH

Equipped with: cooling coil, heating coil, steam / electric humidifier, dehumidification module

1.3 Pressure Control (Non-negotiable)

OR maintains positive pressure > adjacent rooms & corridors

Prevent cross-contamination, bacterial and odor inflow

Differential pressure: +5 ~ +15 Pa

1.4 Airflow Pattern

Conventional OR: turbulent dilution airflow

Ultra-clean OR: vertical laminar flow / horizontal laminar flow to form a sterile protection zone over surgical table

1.5 Fan & Energy Design

Adopt EC fan for stepless speed regulation, stable air volume, low noise

Independent supply & return air system

24/7 continuous operation, high reliability, backup design optional

4.6 Anti-bacterial & Sanitation

All internal panels, coils, condensate pans with anti-mold & antibacterial treatment

Drainage trap design to avoid sewage backflow

Regular self-drying function to prevent mildew growth

Special Functions

Independent fresh air exhaust system to avoid air mixing

BMS centralized monitoring: temp, RH, differential pressure, filter clogging alarm

Low air velocity, low noise operation (<45 dB)

Emergency running mode for power failure backup

Low air leakage casing, thermal insulation to prevent condensation

Material Requirements

Casing: double skin sandwich panel, fireproof, anti-corrosion

Internal metal parts: galvanized steel or stainless steel option

Heat exchanger coil: anti-corrosion coated fin for medical environment

Simple Scope of Work Summary for Quotation

Fresh air mixing, multi-stage filtration

Cooling, heating, humidification / dehumidification

Constant temperature & constant humidity control

Positive pressure maintaining

HEPA final filtration

Sterilization & antibacterial protection

EC fan variable airflow