There are different cascading levels of positive air pressure from the cleanest rooms at the highest pressure down to the gown room or airlock room.
Clean room pressure balancing.
Clean rooms need a lot of air and usually at a controlled temperature and humidity.
Hvac test and balance air and water flow measurement airflow parallelism adjustment duct pressure leak testing minimum and maximum outside air quantity measurement room pressures process exhaust system air balance balance maintenance plans cleanroom certification our extensive approach to cleanroom certification begins.
Air balancing adjusts airflow in the air handling systems to achieve design airflow room air exchange rates and pressure cascade airflow visualization studies qualitatively verifies airflow direction using a source of visible fog tss has several fog options including carbon dioxide glycol and liquid nitrogen.
Positive air pressure means the cleanroom or rooms are pumped up with more filtered air then the surrounding space outside the cleanroom s.
The 2014 fgi guidelines standard 170 2013 provides lists of rooms that should be positively or negatively pressurized with respect to surrounding areas.
Negative pressure is used to contain airborne contaminants within a room.