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Make Up Air

J

jwilly3879

Sawhorse
Joined
Apr 2, 2010
Messages
171
Location
Olmstedville NY
Large Type I hood being installed (2500 cfm) and the contractor wants to pull make up air from the attic space. I referred him to 2015 IMC sections 508 and 401. He insists they do it this way all the time.

Any suggestions?
 
The issue I have is that the attic is insulated with cellulose with soffit and gable vents. At 2500 cfm quite a breeze would be created, sucking cellulose into the hood.
 
If the air in an unconditioned attic is not outdoor then what is it?

In unusually tight construction we can draw combustion air and fresh air in HVAC returns from attics, but not makeup air for exhaust?
 
The 2009 ICC Commercial Kitchen Hood Application Guide suggests checking with the local health departments to see if there is a filtering requirement since the make-up air discharges into food handling spaces.
 
Francis Vineyard said:
If the air in an unconditioned attic is not outdoor then what is it?

In unusually tight construction we can draw combustion air and fresh air in HVAC returns from attics, but not makeup air for exhaust?
Click to expand...


Depends on where you are at, could be full of squirrel air, raccoon air, bee air.

I would rather breath LA city air than any attic air.
 
How are they meeting this?

508.1.1 Makeup air temperature. The temperature differential
between makeup air and the air in the conditioned space
shall not exceed 10ºF (6ºC) except where the added heating
and cooling loads of the makeup air do not exceed the capacity
of the HVAC system.
 
steveray said:
How are they meeting this?

508.1.1 Makeup air temperature. The temperature differential
between makeup air and the air in the conditioned space
shall not exceed 10ºF (6ºC) except where the added heating
and cooling loads of the makeup air do not exceed the capacity
of the HVAC system.
Click to expand...

Haven't even seen the contractor yet, that is the next question I will be asking. This is a municipal job so the whole Town Board is involved and in a big rush.
The first battle was over the sprinkler system. Thread was Titled "Community Hall" this is a continuation of the same project with all the same headaches.
Sometimes I feel like I am swimming upstream dragging an anchor.

Have asked this question to the Technical support group at DOS. They are quite helpful and carry more weight with the powers that be than a lowly employee.
 
jwilly3879 said:
Haven't even seen the contractor yet, that is the next question I will be asking. This is a municipal job so the whole Town Board is involved and in a big rush.
The first battle was over the sprinkler system. Thread was Titled "Community Hall" this is a continuation of the same project with all the same headaches.
Sometimes I feel like I am swimming upstream dragging an anchor.

Have asked this question to the Technical support group at DOS. They are quite helpful and carry more weight with the powers that be than a lowly employee.
Click to expand...


I love city buildings!!!!
 
steveray said:
How are they meeting this?

508.1.1 Makeup air temperature. The temperature differential
between makeup air and the air in the conditioned space
shall not exceed 10ºF (6ºC) except where the added heating
and cooling loads of the makeup air do not exceed the capacity
of the HVAC system.
Click to expand...
Note the exception.

Commentary "Makeup air that is not introduced directly into or close to the exhaust hood must be tempered to within 10ºF . . . "

To begin with commercial kitchen tend to run hot from cooking operations and it's a waste to draw conditioned outside fresh air from other areas or the dining area.
 
jwilly3879 said:
Haven't even seen the contractor yet, that is the next question I will be asking. This is a municipal job so the whole Town Board is involved and in a big rush.
The first battle was over the sprinkler system. Thread was Titled "Community Hall" this is a continuation of the same project with all the same headaches.
Sometimes I feel like I am swimming upstream dragging an anchor.

Have asked this question to the Technical support group at DOS. They are quite helpful and carry more weight with the powers that be than a lowly employee.
Click to expand...



And you still have a job??

You must be doing something right.
 
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