Скачать или смотреть Air Handling Unit ( AHU) IN a Modular Operation Theatre (MOT)

In a Modular Operation Theatre (MOT), an AHU stands for Air Handling Unit. It is a critical component of the Heating, Ventilation, and Air Conditioning (HVAC) system, specifically designed to maintain sterile, temperature-controlled, and contamination-free air in the surgical environment.

🔧 What is an AHU?
An Air Handling Unit (AHU) is a large metal box or unit containing:

Blower/Fan

Filters (HEPA filters in MOTs)

Cooling/Heating coils

Humidifier/Dehumidifier

Dampers and ducting
It takes in outside air, conditions it (filters, cools/heats, humidifies), and then delivers it to the operation theatre through ducts and laminar flow systems.

🏥 Role of AHU in a Modular OT:
Function Purpose
Air Filtration Removes dust, microbes, bacteria; HEPA filters (up to 99.97% efficiency) ensure sterile air.
Laminar Air Flow Ensures unidirectional flow of sterile air over the surgical field, minimizing infection risk.
Pressure Control Maintains positive pressure inside the OT to prevent contaminated air from entering.
Temperature & Humidity Control Maintains optimal conditions (usually 20–24°C and 50–60% RH) for surgery.
Air Changes per Hour (ACH) Ensures 20-25 air changes per hour, as per NABH and international norms.

🧪 Why It Matters:
Prevents surgical site infections (SSIs)

Ensures compliance with NABH, NABL, and ASHRAE standards

Supports cleanroom classification (often Class 100 or ISO Class 5–7)

Summary:
An AHU in a Modular Operation Theatre is a specialized air handling system that ensures sterile, temperature-controlled, and contaminant-free air via HEPA filtration, laminar airflow, and pressure control, which is essential for safe surgical procedures.