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Best practice for installing a vented range hood?
I have a vacation cottage in northern Michigan. I'm planning to put on cedar siding in the spring so right now I'm thinking ahead to trim, light & outlet mounts, etc. A vented range hood is planned. I'd like to install an above-range microwave that vents to the outside. The wall in question is the north-facing wall and since the cottage is on a lake it can get windy there. Is there anything more energy conservative than cutting a big hole in the wall & pushing a sheetmetal collar through it? I'm concerned for drafts, heat loss & an ice-cold microwave in the winter.
I've installed a couple such microwaves in the past but both times the vent went up into the kitchen soffit so the long run made the leaky damper less of a concern. This kitchen won't have a soffit so using the rear outlet & going right out the wall seems most logical.