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Laboratory Fume Hood Exhaust Fan Information

Laboratory Fume Hood Exhaust Fan Information

Laboratory Fume Hood Exhaust Fan Information

Hello, I posted this to the HVAC/R group but looking around the forum I think it may belong here. I am a relatively new engineer and I am trying to design an exhaust fan for a fume hood. I am having trouble figuring out when a "laboratory" exhaust fan is required and if bypass air is required for dilution. Our client will be using Methylene chloride and potassium chloride; I have the data sheets and evaporation rates (relative to butyl acetate) but I can't find information on when a proper laboratory exhaust fan and bypass air is required. I have searched for a few hours online and through ASHRAE HVAC applications and the industrial ventilation manual but I'm having a tough time coming up with answers. If anyone can point me in the right direction, that would be great! Thanks!

RE: Laboratory Fume Hood Exhaust Fan Information

I recommend using ACGIH for a beginning.

RE: Laboratory Fume Hood Exhaust Fan Information

ACGIH sets the limits of exposure of the contaminants. Be sure that you understand the terms used in that reference. You can calculate the concentration levels of those contaminants using their evaporation rates so you should be able to determine the flow rate of fresh air needed to maintain concentration levels below the limits established by ACGIH. You can also search OSHA and NIOSH permissible exposure limits of the same contaminants and use the more restrictive limits when calculating the flow rate of fresh air thru the fume hood. I have more information in my archives at home but I am on vacation and next week I'll send you more information that I compiled over the years.

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