# Room Difference pressure

by enmuaxuan
Tags: difference, pressure, room
 P: 2 I have a room 6x6x3 m I want to maintain the Difference pressure between the room and outside area 30Pa. How can i calculate the rate of supply and exhaust air flow to do it? is there a formular to calculate? Pls help me. Thanks in advance
 P: 7 Use Q = 0.83AP^-n, where Q = net flow rate, A = effective area of leakage, P = differential pressure, and n = 1 to 2 (1.6 for cracks around windows, 2 for large openings such as doors and windows).
 Mentor P: 21,683 Estimating leakage is extremely difficult. You may need to do it experimentally.
P: 7

## Room Difference pressure

construction standards may also be used as a reference. they have an approximate measurement on leakage areas based on the type or quality of construction of the building, or room for the case of enmuaxuan. try british standards, specifically BS EN 12101-6:2005. the equation i have given you is also found there.
 P: 2 Thanks. Mervincris, could you give the detail of EN 12101-6:2005? Thank you again. enmuaxuan
 P: 7 no prob. it is specifies the standard for pressure differential systems to prevent the smoke, during fire, from entering critical spaces. usually, these critical spaces are stairwells which are used as means of escape during fire.
P: 7
 Quote by mervincris no prob. it is specifies the standard for pressure differential systems to prevent the smoke, during fire, from entering critical spaces. usually, these critical spaces are stairwells which are used as means of escape during fire.
correction: ...it specifies...

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