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Calculating negative pressure

Calculating negative pressure

Calculating negative pressure

(OP)
Is there a calculation to determine how much exhaust is needed in a space to get a desired negative pressure. We have a room with 1200 supply cfm. They are looking for the room to always be a minimum of .01 wc negative. Need to determine how much cfm to exhaust.

RE: Calculating negative pressure

Search this forum, this is a common question.

RE: Calculating negative pressure

Obviously, you have to exhaust more the 1200 CFM. Use the first law of thermo. developed for isothermal condition and such equation can be found in fluid dynamics textbooks; then you can use an inclined manometer to figure out how much of pressure differential you have between inside and outside the room.

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