![]() ![]() The second benefit is that a negative pressure system will keep the heat and contaminants from infiltrating adjoining locker rooms, break rooms or offices. Locating the exhaust fans in the right spot can pull the heat and contaminants away from people, products, or processes. This is important when there are heat, fumes or dust generating sources inside the building. The first is that the location of the exhaust air can be controlled. One way to avoid a dangerous pressure level is to have a backdraft damper installed in the space that will relieve the pressure when all doors are closed.Ī negative pressure ventilation system has two benefits. ![]() If all doors are closed, then a potentially dangerous negative pressure level could develop. When man or truck doors are intended to be the primary source of supply air, then there should be an operating policy that requires one or more of the doors to be open when the exhaust fans are running. Most manufacturers provide charts that will show the pressure drop relative to the face velocity for their louvers. When louvers are used in the supply air openings, the amount of open area in the louver should be sized to keep the air velocity at the face of the louver below a level that causes a dangerous amount of negative pressure. Too much negative pressure may cause man doors to slam open or closed creating a risk for injury if fingers are caught in the door. The amount of negative pressure created in the building depends on the air flow resistance created by the supply openings. When the exhaust fans are on, they create a vacuum in the building which pulls air in through the supply air openings. Negative PressureĪ negative pressure environment is created by using fans for exhaust air and louvers or doors for supply air. In this week’s blog I’ll discuss the benefits of both, the factors that should be considered, and how the ventilation equipment should be sized to achieve the desired positive or negative pressure. When designing an industrial ventilation system, an important design criterion is determining whether the facility requires a positive or negative pressure environment to protect people, products, and processes. ![]()
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