8 inch vent in 2 x 12 rim joist?

[Michael Brown]

It's for our range hood and has a 5 inch now and I would like to put in an 8 inch. 2 x 12 is behind boards in pic.

How much are you allowed to take out of the 2 x 12 rim joist for the second floor?

[Jim Katen]

You can notch out the full depth of the rim joist. 

8" sounds large. The range hood manufacturer will specify the diameter of the duct. 

[Michael Brown]

Thanks Jim!

Long story but putting in a remote blower with 20ft of duct because of new addition. Gas stove was constantly setting off fire alarm... noise etc.

 

[Marc]

Where within the house is that fire alarm?

[Michael Brown]

We have a high cathedral ceiling with one in the center and one on main floor in hallway. They are wired together.

Cooking on little back burners is fine but the front sets it off all time.

[Marc]

1 hour ago, Michael Brown said:

We have a high cathedral ceiling with one in the center and one on main floor in hallway. They are wired together.

Cooking on little back burners is fine but the front sets it off all time.

Keep the fire alarms away from the kitchen. In a cathedral ceiling keep it at least 4 inches away from the top but no lower than the point where the two ceiling surfaces are 6 feet apart.

Edited May 30, 2022 by Marc

[Jim Katen]

Also, throw away any ionization smoke alarms and replace them with photoelectric ones. 

[Michael Brown]

Thanks for the tips!

The top detector is about 2 inches off top and we only have about 2 ft. of flat ceiling down the center. Makes sense it gets concentrated in the center rather than spread out on a flat ceiling.

I think one of the alarms is the ionization style also.

Worked okay until we got the gas stove.