I am installing a new range hood in place of an old over-the-range microwave/hood, and trying to use the existing cutouts as much as possible. The previous owner didn't use too much care in installing, it's basically a rough rectangular hole in the drywall and a bit of snipped round ductwork (just the width of the wall) that goes directly outside. I want to fabricate some sheet metal to gracefully use the existing outside vent. Will this be a problem? Should I instead go ahead and cut a big hole all the way through and install a new vent cap? Thanks!
2007-11-29 16:09:28 · 7 answers · asked by jumpinggrendel 2 in Home & Garden ➔ Do It Yourself (DIY)
These previous answerers are crazy. Have they ever heard of codes?
You need to transition to 7" duct. Nothing smaller.
It will be noisy and not pull any grease or smoke out of the house.
3 x 14 duct is 42 sq. inches
7" round is about 38 sq. inches
8" round is about 50 sq. inches.
2007-12-01 15:28:07 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Shouldn't be a problem at all. In fact, sounds like yours will be a safer ventalation. A vent cap, of course is not only necessary for code, but also to keep weather elements, rodents, sparks (highly unlikely) out of your home and also because of the "finished" look and appeal.
It's nice you are taking the time to do it right. So many homeowners jerry-rig a vent if a re-do is needed and duct tape the seams which only come undone within a year so that the duct work serves no purpose.
It sounds like you won't need this, but I have used the DIY network in the past for new projects and for review before embarking on one I haven't tackled for a while.
A links at the bottom.
The link is for installing the hood AND installing new or replacement venting. It includes materials and a step by step video.
Happy project!
2007-11-29 16:29:10 · answer #2 · answered by ? 5 · 0⤊ 1⤋
Your explanation is pretty clear; as no range hood needs more than a 3 inch duct.
Certainly FINISHING the aesthetics is what I'm reading.
Beyond that; it's a vent for a range; not a heating or AC vent setup, and you'll not notice any difference in the appliances effectiveness.
2007-11-30 00:20:33 · answer #3 · answered by DIY Doc 7 · 0⤊ 0⤋
Perhaps I am reading this wrong, you want to take the output of your new range hood that is 14"x3" to a 3" round duct that goes outside?
That is not going to do you much good at all. Going from a 14x3 to a 3" duct is a huge reduction in capacity. You will see a huge decrease in efficiency of your new hood. It is best to run the 14x3 to the exterior or if you must use a round duct go with a minimum of 6".
2007-11-29 17:43:52 · answer #4 · answered by mike b 5 · 0⤊ 0⤋
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2016-11-13 01:19:46 · answer #5 · answered by ? 4 · 0⤊ 0⤋
Usually they step it down to 2" when venting it through a wall or roof.
2007-11-30 04:26:54 · answer #6 · answered by captbob552 4 · 0⤊ 0⤋
what your doing is fine
3" is more than enough vent.
2007-11-30 01:05:32 · answer #7 · answered by ktbug3335 5 · 0⤊ 0⤋