Old Kitchen Brick Exhaust
I have a 90yr old 2-story home with an old brick exhaust that currently has a 6inch "flex" pipe inside that is venting the furnace from the basement.
I need to vent my kitchen rangehood through the same exhaust...and would like to know if i can tie into the existing "flex". My concerns would be losing the bottom of the flex when i cut into it, tight working space, fire safety (grease into same furnace vent), & pipe size for 500cfm hood.
I have been told by plumbers that range exhaust can go down to 3inches...if this is true, I could probably cut a hole into the side of flex and seal it somehow. Is this possible & safe?
Any help is appreciated!!!