Introduction

One of the most critical parts of the operating room is the central sterile area — the zone where the operating table and scrub table are located. In this area, the exposed surgical site is highly vulnerable to contamination, and the entry of even a single microorganism can cause infection. Therefore, precise air control in this zone is of great importance.

Traditional methods such as the Point Box Filter system could not provide full control over the airflow or prevent turbulence. For this reason, the use of Laminar Airflow systems is recommended in the Safe Hospital standards. This system gently delivers fresh, particle-free air at a uniform velocity of 0.23 to 0.25 m/s directly over the surgical table and sterile field, effectively preventing air turbulence.

HEPA Filter Installation

In the Point Box Filter method, the HEPA filter is installed within the HVAC unit, which can create favorable conditions for bacterial growth due to humidity and temperature inside the ducts.
However, in the Laminar Airflow system, the HEPA filter is positioned at the final stage of the ventilation system — directly in the ceiling of the operating room. This configuration prevents bacteria from being transmitted through the ventilation path to surgical instruments or exposed tissues.

Types of Laminar Airflow Systems

Recirculation Type

This system is designed for energy efficiency, improved air quality, and control of airborne particles within the operating room. Its main features include:

  • Reduction of airborne particles from Class 10,000 to Class 1,000 per cubic meter
  • Recirculation of approximately 50% of the air through F1 and H14 filters
  • Increased air exchange rate, which can reduce airborne infections by up to 98%
  • Equipped with a plug fan system, inverter, power panel, control unit, and 10-inch HMI

Full Fresh Air Type

In this version, all the supplied air is 100% fresh with no recirculation.
This design ensures maximum cleanliness and particle control, making it ideal for rooms requiring the highest level of sterility.

Features and Advantages

Uniform Distribution of Sterile Air

  • Ceiling-mounted units located in the center of the operating room ensure that clean, particle-free air flows evenly over the surgical table and work areas.
  • Accurate control of air entry significantly reduces the risk of airborne contamination.

Increased Air Exchange Rate

  • By focusing airflow specifically over the surgical area, Laminar Airflow systems provide a higher rate of air change in this zone, ensuring continuous delivery of sterile air.

Modular Design

  • The system is modularly constructed, allowing for easy installation in operating rooms and cleanrooms.
  • Optional upgrades and additional features can be integrated as needed.

Applications in Medical and Laboratory Environments

  • Creates a uniform, contamination-free environment suitable for operating rooms and cleanrooms.