----- Original Message -----From: Kim AulettaSent: Wednesday, September 29, 2010 1:42 PMSubject: [DCHAS-L] Need fume hood/fire alarm helpWe have recently renovated 2 floors of our 7 story Chemistry building. This job included adding MANY more fume hoods than were already in the building. The NFPA/ANSI/common sense code requires that the fume hoods stay & the supply air/HVAC system shuts off when the fire alarm is activated. Of course, this now makes the building so negative that they can't easily open the doors at the bottom of the stairwell/emergency exit and all the doors quickly slam shut. The consultant is at a loss of what to do to fix this.
How have your large buildings with numerous hoods dealt with this problem? Have you found a door mechanism that allows a person to overcome the severe negative imbalance and safely exit? Any advice or examples are greatly appreciated.
NFPA 45, Sect. 8.10.4 Fire detection and alarm systems shall not be interlocked to automatically shut down chemical fume hood exhaust fans.
8.10.5 Proper door operation for egress shall be maintained when the supply system shuts down and the lab exhaust system operates, creating a pressure differential.
Lab Safety Specialist
Stony Brook University
EH&S Web site: http://www.stonybrook.edu/ehs/lab/
Remember to wash your hands!
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