The reason for the question is to see if there is anything that can be done to the air flow stream to compensate for the clearance.
smell entering the building
and possibly grease build up
Thanks Paul, the two items you mentioned most probably are included from an over all point of view. However, my goal is to get some quantitative analysis done. For example:
Assuming exhaust air temperature is one of the reasons, I would say the 10'+ would have to be the required distance for the air temperature at exit point (what this point should be?) to drop below a certain combustibility point (another point?). Of course that would have to include the air velocity which is another perimeter that is usually specified for air flow.
If this analysis is correct then we could cool the air at exit point and reduce the 10'+ for example to 9'+
I hope I am explaining correctly where I am going with the analysis.
Will look at the NFPA books next week and see if anything there.
the other things are is it upwards exhaust, up and to the side, or straight out a sidewall, a few variables.
plus like other standards/ codes sometimes the numbers shown are committe numbers. A compromise say between one and twenty feet???
the ten feet has been in there forever. I saw a few places where it can be reduced.
i would say the major reason is to keep the smell from coming back into the building.
Is the distance of 3" from NFPA 96 or ICC requirements?
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