Range Hood venting questions
Unfortunately, due to the type of hood we selected and the way it's recirculating kit works, I need to find a way to vent our new range hood outside, and I have a few questions about the requirements of doing so.
The range hood has a rectangular exhaust on the unit, and I was going to use a rectangular vent through the cabinets above it into the attic. From there I would probably switch to a round vent duct (can't remember what size the manual says right now) to go out the back wall of the house rather than the roof.
My questions are these:
Does the ducting have to be double lined, or can I use single lined ducts? What are the clearance consequences of using either material if my attic has blown in insulation? The range is a residential 4 burner gas model.
Can I use an existing attic opening out the back of the house, or do I have to make a new hole? My hope is to avoid going out the roof because there is an old asbestos vent close by and I would prefer to make no more holes in my roof than necessary.
The attic space currently has a couple of different air vents, some decorative brick (6"x12") and one larger (12"x12") metal louvred ones. I would like to hide the vent behind the metal one, is that allowed?
Are there any pitfalls I should be aware of? Anything I'm forgetting?
Thanks so much for your help.