AeroMed Isolation Rooms
AeroMed 625W

AeroMed Negative Pressure Isolation Rooms

AeroMed air purifiers are frequently used to create negative pressure isolation rooms for applications including M. tuberculosis and SARS.  Exhausting air through an AeroMed HEPA air purifier can help a facility create a negative pressure isolation room that meets CDC recomendations for controlling the spread of nosocomial infections in healthcare facilities.

Every healthcare facility is different and to accomodate these differences AeroMed has designed several HEPA purifiers capable of creating negative pressure.  AeroMed manufactures exhaust units that are wall mounted, ceiling mounted, ducted and portable.  This variety of equipment choices allows each facility to match the equipment to the application.

What is a Negative Pressure ?

According to the CDC negative pressure is the relative air pressure difference between two areas in a healthcare facility. A room that is at negative pressure has a lower pressure than adjacentareas, which keeps air from flowing out of the room and into adjacent rooms or areas.

Testing a Negative Pressure Room

Negative pressure rooms may be tested using two primary methods, smoke test and room pressure monitors.  A smoke test is the most reliable method of testing but is only a qualitative method which is a snapshot in time and is labor intensive.  Room monitors are an accurate, quantitative method that provides room status 24/7/365.  Room monitors, however, must be properly installed and maintained in order to be effective.

Smoke Testing a Negative Pressure Isolation Room

To check the negative pressure in a room by using a smoke tube, hold the smoke tube near the bottom of the door and approximately 2 inches in front of the door, or at the face of a grille or other opening if the door has such a feature, and generate a small amount of smoke by gently squeezing the bulb.  The smoke tube should be held parallel to the door, and the smoke should be issued from the tube slowly to ensure the velocity of the smoke from the tube does not overpower the air velocity. The smoke will travel in the direction of airflow. If the room is at negative pressure, the smoke will travel under the door and into the room (e.g., from higher to lower pressure). If the room is not at negative pressure, the smoke will be blown outward or will stay stationary. This test must be performed while the door is closed. If room air cleaners are being used in the room, they should be running.