Ventilation

[Sailor]

Hi

Our building inspector has asked me to hook up an explosion proof fan to an ethanol vapor meter. I have both and ready to install but first he wants to know what the ifc and ibc say about the volume of air that need to be remove if there is a build up of vapors that would trigger the system. Can anyone help me with a quote referencing on or both of these publications. 
Thank You

[Streven]

Sailor,

Out of curiosity, what explosion proof fan are you using?  My insurance inspector asked for the same thing.  I have an RKI model PS-2 gas monitor, but still need to get the explosion proof ventilation fan to connect to.

He references FM Global Data Sheet 7-74 for distilleries (attached).  The building inspector hasn't required this in my area, but insurance is.  This may or may not be of use to you, but thought I would share.

FMDS0774.pdf

[bluefish_dist]

My understanding is that about 1 cfm per sq ft will keep most areas below the 1/4 or 1/2 lel, don't remember exactly which it is.  With that level of ventilation the area is not classified.   I know Dalkita can provide the engineering for such a system.  

[Hudson bay distillers]

our engineer told us that 6 air changes per hour is the base line for sizing ventilation fans . not sure if that helps . 

tim 

[whiskeytango]

Your building inspector wants you to tell him what the code says? Shouldn't he know what he is asking for.