×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Laboratory Fume Hood Exhaust Fan Information

thread1043-458112

Laboratory Fume Hood Exhaust Fan Information

Laboratory Fume Hood Exhaust Fan Information

(OP)
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!
Replies continue below

Recommended for you

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.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


News
Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close