![]() ![]() Negative pressure rooms are most commonly found in hospital setting. One air change occurs in a room when a volume of air equal to the volume of the room is supplied and/or exhausted. The number of air changes in the room will determine how high of a negative pressure the room has. Medical facilities often isolate patients with aerosol based infections in negative pressure rooms to prevent cross contamination from room to room. This can be used to prevent infectious or harmful particles within the space from leaving the area. If you were to open a door in a negative pressure room, the air from outside the room would be sucked into the space. ![]() This is because air will naturally flow from areas of higher pressure to areas of lower pressure. In short, it prevents air and bacteria from flowing out of the room. This creates lower air pressure, which allow air to flow into the environment but not from the environment out. Negative room pressure is created when the air exhausted out of the room is greater than the amount of air coming into the room.
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