Quote:
Originally Posted by aigel
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?
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It could be 8" if the old vent was a powerful one. The only way to tell is to get up there and measure it. If it's 8" use one of these.
Hold it all together with self drilling screws.
Quote:
Originally Posted by aigel
- 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)
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I guess it would be OK, but I would use 2 adjustable ells and a piece of straight duct. It's cheaper and not much more work. Again, use self drilling screws to hold the pieces together.
Quote:
Originally Posted by aigel
- Do I need to insulate the ducting? I am in a moderate climate in the San Francisco Bay Area.
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Probably not. The only danger is moisture condensing on cold duct work and dripping back into the vent hood, but if it's a short run that shouldn't be a problem.