Less than atmospheric pressure.

a term used to describe the relative air pressure difference between two areas of a health care facility; air (and germs) flow from the higher pressure area into the lower pressure area - away from uninfected people

Condition that exists when less air is supplied to a space than is exhausted from the space, so the air pressure within that space is less than that in surrounding areas.

Negative Pressure is a condition that exists when less air is supplied to a space than is exhausted from the space, so the air pressure within that space is less than that in surrounding areas. Under [..]

A condition of lower air pressure than the surrounding areas, causing air to flow towards the area of negative pressure. Usually induced to limit the spread of dust or contaminants.

Negative pressure occurs when a room or space receives less air than it expels or exhausts. When this happens, the air pressure surrounding the room is more than the air pressure within the room, gene [..]

A condition where the pressure in a space is less than that in surrounding areas. In this case, if openings exist, air from surrounding areas will flow into the negatively pressurized space, thereby containing the air in the negatively pressurized area. This can be useful for containing harmful particles in a particular area, such as in Tuberculosi [..]

A condition that exists when less air is supplied to a space than is exhausted from the space, so the air pressure within that space is less than that in surrounding areas. Under this condition, if an opening exists, air will flow from surrounding areas into the negatively pressurized space.