×
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

Combined Kitchen Ventilation ( Continuous+ Intermittent )

Combined Kitchen Ventilation ( Continuous+ Intermittent )

Combined Kitchen Ventilation ( Continuous+ Intermittent )

(OP)
Hi
I have a rather large residential kitchen and I already have an Exhaust Kitchen Hood (550 CFM) in there. The kitchen hood will operate intermittently. Would there be an added benefit to adding a Ceiling Exhaust Grill linked to the residence's continuous exhaust system?
If there is an added benefit from this an issue, I'm also thinking about is that any vapors grease..etc remaining in the air would leave a smear on the ceiling around the exhaust grill. Is this true or am I being too cautious?

Best Regards

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

For kitchen restaurants of any large magnitude, your best bet would be to have a push pull system which is expensive. In the long run, however, you could save on A/C and heating loads.
Tying up to an existing exhaust system, you will reduce the exhaust flows of the existing exhaust vents already in line and become subject to the irate ranting of the people being affected.

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

(OP)
chicopee,
Thank you for the response. Don't think a Push-Pull system is necessary on this project.
As for your second comment, the entire project is still undergoing design, nothing has been built yet so the issue you mentioned should not be a problem. So do you recommend this approach? Or is the intermittent exhaust from the Kitchen Hood sufficient for a high level of air quality?

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

The kitchen hood/fan should be adequate if properly sized and you can guarantee that it will be on when there is cooking. You want to keep the kitchen negative to the other spaces.

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

he said residential kitchen, not commercial.

but in residential kitchen you need a MAU when you exhaust more than 400 cfm. Not sure what sort of residence that is that you need more than 400 cfm. Unless it is a mansion with servants that cook for elaborate dinner parties....

probably best not to return any kitchen air to the regular building exhaust assuming when you cook you turn on that hood. If you really make that much grease, you don't want to dirty-up your regular exhaust system.

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

I do not recommend tying into an existing exhaust system because it will affect other exhaust vents and you can be assured that complaints about cooking odors will abound.

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

A General exhaust grill be useful while warming food in the micro wave which could generate some odour.It can also help to get rid of the burnt smell when that raisin bread slice gets over toastedbigsmile

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

(OP)
Willard3,
Thank you for the response. I am sizing my hood according to 100 CFM per linear foot of range. As for guaranteeing that it will be on I guess that is the owner's responsibility?

HerrKaLeun,
Thank you for theh response. Well you are spot on. It is a mansion with servants that cook for elaborate dinner parties. I do have makeup air, but not through a dedicated MAU, but through the central FAHU.

Chicopee.
Ah now I get you. Can't the odors be avoided if I place Non Return Dampers in the ductowork?

SAK9:
Thank you for the response. That is kind of what I was thinking. But I see that most of the replies don't recommend it. I guess I will do without the Exhaust Exhaust grill especially that the kitchen is in an isolated area.



RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

No, odors always find a way to get around man made obstacles. I suppose you could investigate an air ionization ozone maker since such device will control certain type of odors.

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

Here is what the IMC says,

"506.3.5 Separation of grease duct system. A separate
grease duct system shall be provided for each Type I hood.
A separate grease duct system is not required where all of
the following conditions are met:
1. All interconnected hoods are located within the same
story.
2. All interconnected hoods are located within the same
room or in adjoining rooms.
3. Interconnecting ducts do not penetrate assemblies
required to be fire-resistance rated.
4. The grease duct system does not serve solid-fuel-fired
appliances."

I would not interconnect them unless conditions 1 -4 are met.

Also, if the regular exhaust duct has dampers, do not interconnect them. Dampers are not allowed in grease ducts.

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

Following what Herrkaleun said, it will do more harm than good to mix any kitchen air with the rest of the house ventilation.

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

Relevant article in this month's ASHRAE Journal.

RE: Combined Kitchen Ventilation ( Continuous+ Intermittent )

(OP)
chicopee,
Thank you for the response.

trashcanman,
Thank you for the response. That was very helpful insight.

sprinkler1000,
Thanks to you as well for the seconding.

MintJulep,
Thank you for the response. I guess I will look it up.

Best Regards



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