Understanding How Static Pressure Affects an HVAC System
Static pressure is the difference between the total pressure at a point and the air pressure that flows through an opening. The total pressure is equal to atmospheric pressure plus static pressure, but if you subtract static pressure from total pressure, you get what’s known as dynamic pressure or suction. When you have a fan pulling air through an opening, you have negative static pressure at the exit of that opening. A fan creates a low-pressure zone behind it and pulls air into that low-pressure zone, creating negative static pressure. If there’s no fan pulling air through
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