Technology to address kitchen exhaust

[MedicineEng]

Hi All:

In our property we are currently expanding our F&B offering and now we are facing an issue of kitchen exhaust smell shortcircuiting to some fresh air inlets.

We will be moving the fresh air intake further away from the kitchen exhaust but I feel that the problem has to be treated at the source. Also, we are running out of roof space and with the pipeline of new F&B offering, this will strategy will be short-lived.

We do have kitchen exhaust odour treatment with electrostatic precipitators and carbon filters but despite that, we still have kitchen exhaust smell.
Given that this type of odour is very pungent, it doesn't need much for people to notice it.

I wonder if anvbody had the same problem before and if there is any other technology out there that could be more effective than the current EP+carbon filter setting.

Thanks a lot.

 

[trashcanman]

As per your question, "We will be moving the fresh air intake further away from the kitchen exhaust but I feel that the problem has to be treated at the source. Also, we are running out of roof space and with the pipeline of new F&B offering, this will strategy will be short-lived."

Duct the fresh air intake away from the exhaust, by at least 10' (code requirement). The ducting may have to extend off the roof and down the exterior wall. So be it.

If the exhaust is greasy smoke, filters will not be effective, as they will quickly clog up. This is especially true for carbon filters. They are for odors, not particulate matter or grease droplets and are expensive to replace.

The exhaust MUST not be allowed into the outside air intake.

 

[MedicineEng]

trashcanman:

The fresh air intake is more than 10 meters away from the kitchen exhaust but sometimes the wind changes and despite the distance, it finds its way to fresh air.

 

[itsmoked]

I suggest you get a nozzle system going then. Silicon Valley has some noxious exhaust you never want to get back into a building. What they frequently do is put a small blower on the roof at the base of a duct nozzle. The exhaust ends up leaving at 30MPH vertically.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[dbill74]

Where is the odor entering the space from? A make-up air fan or space conditioning AHU?
Where is this kitchen located? What is the direction of the prevailing winds? Locating the hood exhaust downwind and pointing away from any air intakes will help a lot.
The solution proposed by Keith is expensive and really intended for lab exhaust.

Have you looked at the space air flow relationships? If the kitchen is positive relative to adjacent spaces, that could be contributing to the odors.

 

[chicopee]

I would suggest 10' higher than the exhaust outlet assuming the exhaust opening is fitted with a roof cap.