Calculating Outdoor Air in Dwelling Unit

[Gregg Harris]

Notes "b' 'c' and "g' make the kitchen, bathrooms. and closet excluded or "prohibited" from being circulated.

 

[wwhitney]

IMC 601.5(7) Should prevent the air from being "well mixed,"

If you have a kitchen with no supply openings (and no return openings as per your IMC reference) and it has closed doors from the rest of the dwelling unit, I could see omitting from the ventilated volume of the rest of the dwelling unit. [Except that as a living space, the kitchen also requires 0.35 ACH, so you'd need a separate system for the kitchen.] But if it has a supply opening, the air will be mixed with the rest of the dwelling unit, since all of that supply air must make it to the return openings (or rather, an equivalent volume of air).

Cheers, Wayne

 

[wwhitney]

Notes "b' 'c' and "g' make the kitchen, bathrooms. and closet excluded or "prohibited" from being circulated.

If you have a single air system for a dwelling unit subject to IMC 403.3.1, seems like those notes just mean you can't put a return air opening in the kitchen or bathrooms (which matches IMC 601.5(7)). If you have a supply opening in one of those rooms, its air will be mixed with the rest of the dwelling unit as the air returns to some return opening.

Cheers, Wayne

 

[Gregg Harris]

If you have a kitchen with no supply openings (and no return openings as per your IMC reference) and it has closed doors from the rest of the dwelling unit, I could see omitting from the ventilated volume of the rest of the dwelling unit. [Except that as a living space, the kitchen also requires 0.35 ACH, so you'd need a separate system for the kitchen.] But if it has a supply opening, the air will be mixed with the rest of the dwelling unit, since all of that supply air must make it to the return openings (or rather, an equivalent volume of air).

Cheers, Wayne

Where in the code does it specify that the kitchen is considered part of the living space?
Where in the table 403.3.1.1 does it say that 0.35 ACH is required in the kitchen?

 

[wwhitney]

Where in the code does it specify that the kitchen is considered part of the living space?

The definition of living space in Chapter 2 of the IMC: "Space within a dwelling unit utilized for living, sleeping, eating, cooking, bathing, washing and sanitation purposes."

Where in the table 403.3.1.1 does it say that 0.35 ACH is required in the kitchen?

That table uses the term "living areas" for some reason, which is not defined in Chapter 2, but it appears to be synonymous with "living spaces".

Cheers, Wayne

 

[Gregg Harris]

The definition of living space in Chapter 2 of the IMC: "Space within a dwelling unit utilized for living, sleeping, eating, cooking, bathing, washing and sanitation purposes."


That table uses the term "living areas" for some reason, which is not defined in Chapter 2, but it appears to be synonymous with "living spaces".

Cheers, Wayne

Habitable space
A space in a building for living, sleeping, eating or cooking. Bathrooms, toilet rooms, closets, halls, storage or utility spaces and similar areas are not considered habitable spaces .

 

[wwhitney]

Habitable space
A space in a building for living, sleeping, eating or cooking. Bathrooms, toilet rooms, closets, halls, storage or utility spaces and similar areas are not considered habitable spaces .

I don't see that definition in the IMC. And Table 403.3.1.1 doesn't use the term "habitable space." So I'm not seeing the relevance.

Cheers, Wayne

 

[Gregg Harris]

I don't see that definition in the IMC. And Table 403.3.1.1 doesn't use the term "habitable space." So I'm not seeing the relevance.

Cheers, Way

IBC 201.3​

Terms defined in other I codes


It is in IBC, IPMC, IRC, and IEC.
2020 NEC even has it in definitions. Clarity does need to happen. I believe I may make a proposal for the term cohesion by looking at the previous ROP for the definitions.