Rated Shaft over Kiln in a V-B Building

[pilgrim]

I have a Type V-B, 1 story building. Mainly E occupancy. Building is on a school campus. We plan on enclosing 1 area of a Classroom. This area has an existing Kiln (oven) for ceramic projects. This new area will be an F-2 occupancy and will require a 1 hour fire barrier separating it from the rest of the spaces. To my knowledge the existing Roof assembly has no requirements for rating (being a V-B).

Question: The existing Kiln has a metal hood and integral vent shaft that penetrates thru the ceiling. I'm trying to determine if a fire rated shaft is required...

I'm using CBC referencing 713.4. Accordingly, it appears that I have to have at least a 1 hour rated shaft. However, I thought reading elsewhere that if the Roof assembly has no rating then a rated shaft is not necessary...

Thanks for the help!

 

[cda]

The kiln room is an "E"

 

[cda]

http://www.thebuildingcodeforum.com/forum/forum/commercial-codes/commercial-fire-codes/10652-commerical-ceramics-kiln-install

http://www.thebuildingcodeforum.com/forum/forum/commercial-codes/commercial-mechanical-codes/2232-kiln-exhausting-into-public-way

 

[pilgrim]

Thanks for the info on Kilns cda. This is my first time with these units, so I appreciate it.