×
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!
  • Students Click Here

*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

Jobs

NFPA 20 VENTILATION

NFPA 20 VENTILATION

NFPA 20 VENTILATION

(OP)
Good morning.  I am looking for guidance to help determine fan capacity for a venitlation fan on a diesel driven fire pump.  In NFPA-20, Section 11.3.2, there is guidance on the maximum differntial pressure allowed between the inside and outside of the building, but that does not answer capacity.  Is there another NFPA code that addresses the design of the ventilation system?  Is there a minimum time period in which the air in the building needs to be 'turned over'?  Any help is greatly appreciated.

RE: NFPA 20 VENTILATION

Check NFPA 496 to see if applicable to your situation.

RE: NFPA 20 VENTILATION

Add up the air drawn into from:
a) the combustion air drawn into the engine, and
b) the radiator fan air drawn into the room (and blown across the radiator to the outside).

Once you get this cfm, then you need to adjust the number.
  
If the diesel pump is in a room adjacent to other areas, then subtract ~5% or so to keep the room negative relative to other spaces.

The number you come up with is the amount of air that needs to be brought into the room by whatever means is appropriate.  You should try to create somewhat of a crossflow in the room.  In other words, dump the supply air into the opposite side of the room from the radiator fan.

That is my two cents anyway.  
 

RE: NFPA 20 VENTILATION

The first question should have been what is the purpose of the ventilation fan?

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!


Resources