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Q: Egress rate from a resturaunt ( Answered ,   3 Comments )
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 Subject: Egress rate from a resturaunt Category: Miscellaneous Asked by: smallbusinessjim-ga List Price: \$10.00 Posted: 24 Mar 2006 13:24 PST Expires: 23 Apr 2006 14:24 PDT Question ID: 711575
 ```I need to know the rate of egress for people in a resturaunt environment through a standard door. For example: "100 people are sitting in a dining room, the fire alarm goes off, there are 2 doors, how long till everyone is outside?" What I really need is a time per person, then I can apply the math to the occupancy of our resturaunt. I will also need a source for the information to backup my findings.```
 Subject: Re: Egress rate from a resturaunt Answered By: cynthia-ga on 24 Mar 2006 16:15 PST Rated:
 ```Hi smallbusinessjim, Egress is measured in "people per minute." The short answer to your question, with an impeccable source --is this: 26 people per foot (width) of door, per minute. Calculate rate of egress: Stairway rate 18 people/foot/minute. For a 4 foot wide stair the rate is 4 feet x 18 people/foot/minute = 72 people/minute Doorway rate 26 people/foot/minute. For a 3 foot wide door the rate is 3 feet x 26 people/foot/minute = 78 people/minute YOUR SOURCE IS: INTERNATIONAL BUILDING CODE ? MEANS OF EGRESS (top right of page 1) http://www.iccsafe.org/cs/codes/2003-04cycle/faa/FAA-IBC-MOE.pdf Density figures and calculations from: SFPE Handbook of Fire Protection Engineering http://www.nfpa.org/catalog/product.asp?pid=HFPE01&target_pid=HFPE01&src_pid=FPH1903&link_type=up_sell Technically, this is the end of your Answer, however I'm passing along all the other resources I found along the way. Note at Evacunet (not as good a source), they measure "headway" : EVACNET4 USER'S GUIDE ? DOORS http://www.ise.ufl.edu/kisko/files/evacnet/EVAC4UG.HTM ..."Headway is an important idea relevant to modeling the flow capacity of doors; headway is the average time between two successive users of a door. If the headway is too small, then successive users of a door would interfere with one another. As an example of headway, if the headway of a door is 1 second, then the average time between successive users is second. Dividing 60 seconds per minute by the headway of a door gives the average flow capacity of the door in people per minute. A door with a headway of 1 second has a flow capacity of 60 people per minute. Fruin [3] points out that "Entrances are, in effect, walkway sections in which pedestrians have been channeled into equal, door-width traffic lanes." This remark suggests that, if carefully used, flow volume for walkways may be applicable for doors. Fruin [3] gives data for several entrance doors. For free-swinging entrance doors, he has observed that average headway is 1.0 and 1.5 seconds, giving 40 to 60 people per minute being able to use the doors. In the case of a door revolving in one direction, he has observed that average headway is between 1.7 and 2.4 seconds, giving 25 to 35 people per minute being able to use the doors..." Means of Egress http://www.ci.seattle.wa.us/dpd/static/1egress_LatestReleased_DPD_001932.pdf NFPA 101B, Code for Means of Egress for Buildings and Structures, 2002 edition http://www.nfpa.org/aboutthecodes/AboutTheCodes.asp?DocNum=101B \$41.00 ADA Accessibility Guidelines for Buildings and Facilities (ADAAG) http://www.access-board.gov/adaag/html/adaag.htm Hope this helps! If you need clarification, please don't hesitate to ask. ~~Cynthia Search strategy used at Google: "building codes" evacuation "people per minute" egress```
 smallbusinessjim-ga rated this answer: and gave an additional tip of: \$2.00 ```Thank you. Exactly what I was looking for, we researched codes but never made it to the NFPA Books.```

 ```That will depend on a lot of things. I assume you are thinking of how long it will take to evacuate the restaurant in case of a fire? You need to look at the layout of the room and where the tables are. How long before an alarm is sounded to evacuate? How good or poor is the visibility? There could be smoke or the power and lighting could go out. Are there other traffic bottlenecks besides the doors? How long before the first people start to exit? How many people can exit the doors before a backup at the doors starts? Will equal numbers of people go to each door or will most go to the main entrance rather than the second door? What about stragglers? This could include people in the bathrooms, the disabled, etc.```
 ```True, there are a lot of components to the study, but all I'm asking is for the rate of travel through a door. Assume a big room, well lit, no smoke, no bottlenecks and a line of people at the door. Moving in an orderly fashion, what is their rate of exit?```
 ```As others have said, there are so many imponderables. For example with airlines they always make sure that fit and capable people sit beside the emergency exits. Reputedly they also do their tests with students wearing trainers. Personally in that situation I would head for the window and put a chair through it - people panic - and crowds get out of control very easily.```