[aigel]

Here some home improvement questions for the brain trust, please:

I bought a hood (a hood microwave) that puts out 400 cfm and need to vent it. The current kitchen did not have a hood, but the previous one probably did, because the single story home's roof has an existing vent in the roof above the oven area.

The hood puts out into a rectangle which I adapted to a 6" diameter ducting starting in the cabinet and I am done running solid 6" duct into the attic.

The roof vent is a chimney looking job. It looks like it is 8" on the base and runs down in diameter to 6? There isn't a flange or anything to connect to.

Questions:

- It is not clear to me how to connect to the existing roof cap. Do I push a 6" solid duct into this until it "locks" / wedges into place? Or could it be an 8" cap and I need an adapter?

- Is it okay to connect two solid ducts from kitchen to roof with a flex duct to make up for the offset (about a foot offset and 2-3 feet of ducting, I guess)

- Do I need to insulate the ducting? I am in a moderate climate in the San Francisco Bay Area.

Thanks!

George