presurization of main stairs¦ building
presurization of main stairs¦ building
(OP)
Hello
I need to select a fan to presurize a 21 floors bulding´stairs. Which parameter will determine de cfm required for this porpuse? the building is located in Dominican Republic.
Thanks.
I need to select a fan to presurize a 21 floors bulding´stairs. Which parameter will determine de cfm required for this porpuse? the building is located in Dominican Republic.
Thanks.





RE: presurization of main stairs¦ building
Then you need to know tha pressure you want to maintain in the stairwell which will be influenced by the openings to the stairwell.
RE: presurization of main stairs¦ building
RE: presurization of main stairs¦ building
RE: presurization of main stairs¦ building
It would be something like this:
With 3 doors fully open(floor on which fire is on+floor just below+exit door)and all other doors fully shut,an air velocity of 2m/s should be achieved across the door area.
Assuming 2.1mx1m doors,
required air flow= 3x(2.1x1m2)x 2m/s=12.6 m3/s
You must add a safety margin for leakage from ducts,doors on other floors,wind effect etc.I have used figures as high as 1.25.
When all doors are closed,a pressure differential of 50 pa must be achieved between the stairwell and the corridor.The force that needs to be exerted at the door handle should not exceed more 100N.