Can kitchen exhaust duct go inside corridor wall stud bay?

[Yikes]

2 story Type V-A apartment building with corridor. Have a nonstacking unit situation where the best/easiest location for a kitchen exhaust hood vent up to roof is a 26 ga. metal duct inside the stud bay cavity on the upper floor corridor.

This particular corridor wall happens to be non-loadbearing, but CBC 1018 and 708.1 require it to be a one-hour fire partition. It is normally 2x4s with 5/8" gyp, RC channel on one side, and sound insulation.

Is there some way to simply line the corridor stud bay cavity with drywall to maintain the 1 hour corridor rating, while allowing the kitchen exhaust to through-penetrate the corridor wall?

 

[cda]

Interior corridor??

Open at the ends or doors to walk through??

Will it vent into the corridor ?

 

[mark handler]

It's a stretch but....

CALIFORNIA MECHANICAL CODE

510.8 Termination of Exhaust System.

510.8.1 The exhaust system shall terminate as follows:

Outside the building with a fan or duct.

California Building Code

716.5.4 Fire partitions.

3.5. The duct shall not terminate at a wall register in the fire-resistance-rated wall.

 

[Yikes]

The corridor is unconditioned and has natural ventilation, but it most closely resembles a double-loaded corridor. I'd normally just furr an additional shaft next to the corridor wall, but this is a narrow corridor and unit and I don't have that luxury.

 

[cda]

The corridor is unconditioned and has natural ventilation, but it most closely resembles a double-loaded corridor. I'd normally just furr an additional shaft next to the corridor wall, but this is a narrow corridor and unit and I don't have that luxury.

I was just wondering if you are going to get cooking smells into the corridor???

Plus you are penetrating a rated wall?

 

[conarb]

The corridor is unconditioned and has natural ventilation, but it most closely resembles a double-loaded corridor. I'd normally just furr an additional shaft next to the corridor wall, but this is a narrow corridor and unit and I don't have that luxury.

I'd say install a fire damper where the hood/fan enter the rated wall, if you are then concerned that the tin duct will somehow heat up and destroy the walls rating design a ductless chase, we did those a lot in the 50s and 60s with return air between joists, cheaper too.

 

[Yikes]

Thanks everyone. It turns out that we found another route that keeps it out of the corridor wall, so for this project the question is moot. It still is interesting to ponder.

 

[steveray]

As long as the penetrations are rated and rating is maintained, I do not believe there is anything that specifically does not allow it. Vertical exit enclosure no, but corridor yes...

 

[JBI]

Also, it is a membrane penetration, not a through penetration.