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


Jet Fans for Parking Exhaust Systems

Jet Fans for Parking Exhaust Systems

Jet Fans for Parking Exhaust Systems

Dear All,

I am working on a project of basement exhaust system I have proposed the conventional ducting system but the client wants jet fans instead of ducting I dont have any idea can any one help me out?? any calculations? any materials ? sources?? case studies??


RE: Jet Fans for Parking Exhaust Systems


Impulse or jet fan: An axial fan with a high velocity discharge that induces air flow in a long underground tunnel without ductwork


As for calcualtions, that will be code based. Ususally low exhaust during normal conditions, and a higher rates of exhaust when carbon monoxide levels get high. (something like 1.5 cfm/sf from memory).

knowledge is power

RE: Jet Fans for Parking Exhaust Systems


Can you tell how do i place them? i mean positions of jet fans, should i place them at the points where i have placed diffusers or place them in such a way that diffusers come in between??

RE: Jet Fans for Parking Exhaust Systems

diffusers would be installed on ducted ventilation systems so, I am a little confused by your statement that your client wants no ducts.

RE: Jet Fans for Parking Exhaust Systems

Perhaps its time for the OP to engage the services of an engineer who is familiar with the technology that the client has expressed an preference for.

RE: Jet Fans for Parking Exhaust Systems

I am not good in communications,
but this attachment might help me to explain what i want to say

RE: Jet Fans for Parking Exhaust Systems

Im sorry I read an underground garage, not basement (so cancel my carbon monoxide comment).

Exhaust rates will be per ventilation code (Ashrae 62?)

As for location, it all depends on the layout. Assuming large rectangular box? Intake on one side and exhaust fan on the other? Or am i oversimlifying it? If you use a jet fan underground and dont duct it, how can you push air above ground and outside? And if you bring in outdoor air as youyr intake how do you condition it.

Just because the client wants it, doesnt mean he knows what he wants or what is good for the buulding (or of ot meets code). What is the reasoning for the jet fans? Is it cost? Im sure with minimal duct and less expensive type of fan, you can provide a less expensive option that will work better.

It is your job as the engineer to provide hime with that info.

knowledge is power

RE: Jet Fans for Parking Exhaust Systems

The PDF drawing has much to be desired as I can not make head from tail about the relative positions of the jet fan diffusers and the ducts.

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!


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