Currently I have a craptastic range hood - I don’t think I’ve ever even used it, because it doesn’t vent anywhere and just kind of lazily stirs the air around. I’m thinking about when I’ll finally redo my kitchen, looking at cabinets, etc. I ran into the range hood part and didn’t really know what to do. Can they, I don’t know, put it up to the roof? I am not going to move the stove (and there’s nowhere to move it to anyway.
Yes, range hoods can be vented through a roof, with a vertical hard metal duct. Just make sure the person doing it knows how to properly cut and reseal that hole.
If the duct goes thru an unheated attic, it should be insulated, otherwise, you would likely get condensation dripping back down.
Range hoods can definitely be vented to the outside even when the stove is on an interior wall. I ran a duct for mine in between the kitchen ceiling and the second floor, and vented it to the outside through the eaves.
Depending on a bunch of things, this could be fairly easy or nearly impossible in your house.
Modern unvented range hoods actually do some good. They will filter out grease and smoke if you keep the filter clean. Venting outside is better, though.
a long duct might just become a grease trap.
a long duct into an unheated space not only allow condensation to form and collect, either running back to the hood or leaking from the duct (mold hazard), it also can be a heat loss.
a filtered unvented hood could be OK.
Oh, I forgot to mention that the wall the oven is on USED to be the exterior wall, so under the wallboard it may well be brick on the other side.
But if there’s not occupied space directly above, I think your idea of going straight up and out through the roof (presumably passing through a cabinet and/or bulkhead between the hood and the kitchen ceiling) is probably best, provided that it’s done right. I assisted in just this kind of installation on a relative’s house a while back.
The roof cut must be done properly, and the point about insulating the duct through an unheated attic is quite correct. Make sure you get an inclusive warranty extending through at least next winter, so you’ll be covered if weather reveals any such failures.
Yes, there is unheated attic directly above - it’s a one story bungalow.