Looking for advice (not pond related) of a home construction nature adding a vent hood for stove (2 story house)


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Maybe my drawings will help. I am convinced that the current set up isn’t at all safe.
You would be correct now I am a bit rusty with my codes in residential but the minimal space between a cook top and ANYTHING above it last i knew way 18". That has to be a royal pain to cook with the back burners
 
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While it's ideal to have the vent directly over the stove, if you have any outside wall in the kitchen at all, you can put an exhaust fan vent on that wall directly to the outside. I've had a through-the-wall in a previous kitchen and it worked fine. You might want to move that microwave anyway, as 12 inches from the gas cooktop sounds like a potential hazard as well as an annoyance.
 
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Do you have a trusted contractor you can ask? We changed out our hood last year and because we had the hole cut for the vent, no contractor would install the new hood! Granite countertops on either side of stove and overhead cabinets. Ended up getting a cabinet jack!
Maybe time for a kitchen remodel????
A good wood worker can take the upper cabinet and rework it so you can raise the microwave up to a legal and comfortable height. I had to do the same to mine as the original builder put in to tall an upper cabinet over the stove . the upper cabinet is almost useless as it is very shallow in height. I believe it's less then a foot tall now.
 

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@GBBUDD Good idea for relocating the m/wave…..except that I’m a shorty and where it is now, any higher and it would be a problem. I’m liking the idea of a total kitchen rebuild(y)(y)
 
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regardless of what you do i would be very weary of something only 12 inches above the stove even if it is metal. the insulating jackets of the wires and coils can get to much heat that low and create a problem.
 
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THESE standards are from the web where it says it is from the codes and standards of Louisiana now i can not guarantee this is what your town requires but it sounds correct. I even saw that california requires 24" now so i would guess it is correct. so please becareful with your 12" space


M1503.1 General


Range hoods shall discharge to the outdoors through a duct. The duct serving the hood shall have a smooth interior surface, shall be air tight, shall be equipped with a back-draft damper and shall be independent of all other exhaust systems. Ducts serving range hoods shall not terminate in an attic or crawl space or areas inside the building.

M1503.4 Makeup Air Required

Exhaust hood systems capable of exhausting in excess of 400 cubic feet per minute (0.19 m3/s) shall be mechanically or naturally provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with not less than one damper. Each damper shall be a gravity damper or an electrically operated damper that automatically opens when the exhaust system operates. Dampers shall be accessible for inspection, service, repair and replacement without removing permanent construction or any other ducts not connected to the damper being inspected, serviced, repaired or replaced.

M1504.1 Installation of a Microwave Oven Over a Cooking Appliance

The installation of a listed and labeled cooking appliance or microwave oven over a listed and labeled cooking appliance shall conform to the terms of the upper appliance's listing and label and the manufacturer's installation instructions. The microwave oven shall conform to UL 923.

Section M1505 Overhead Exhaust Hoods

M1505.1 General


Domestic open-top broiler units shall have a metal exhaust hood, having a minimum thickness of 0.0157-inch (0.3950 mm) (No. 28 gage) with 1/4 inch (6.4 mm) clearance between the hood and the underside of combustible material or cabinets. A clearance of not less than 24 inches (610 mm) shall be maintained between the cooking surface and the combustible material or cabinet. The hood shall be not less than the width of the broiler unit, extend over the entire unit, discharge to the outdoors and be equipped with a backdraft damper or other means to control infiltration/exfiltration when not in operation. Broiler units incorporating an integral exhaust system, and listed and labeled for use without an exhaust hood, need not have an exhaust hood.
 
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I would try @GBBUDD's suggestion first. See which way the ceiling joists run and maybe you can go up into the joist bay, turn 90º and run to an outside wall.

Next best would be to know exactly where in the bedroom above the stovetop is under. If it's in the closet, you might be able to steal a small chunk of the closet and turn it into a chase to hold your vent pipe. Again, either up into the closet, turn 90º and out a sidewall, or straight up into the attic and through the roof.

After that, I'd probably look into a downdraft range. I know you have a slab foundation so won't work going into the floor, but you could steal cabinet space or some space from the room behind the wall to run your vent duct wherever.

Next, I'd go with @SarahT's suggestion about a through-the-wall vent somewhere else close by in the kitchen.

And if all of those still don't work, I'd move. :)
 
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Next, I'd go with @SarahT's suggestion about a through-the-wall vent somewhere else close by in the kitchen.
Vents from a stove can not be blown into a attic or an other room usually it is a code violation
 
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Are you sure about that 12" measurement from cooktop to microwave?
That's definitely dangerous!
12" is not that much room. Even 18" would be ridiculous.

That sounds like you could bearly fit a large pot under there. My big spaghetti sauce pot probably wouldn't fit under there!
 
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Mmathis

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Are you sure about that 12" measurement from cooktop to microwave?
That's definitely dangerous!
12" is not that much room. Even 18" would be ridiculous.

That sounds like you could bearly fit a large pot under there. My big spaghetti sauce pot probably wouldn't fit under there!
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With a solid color cabinet it's a piece of cake to cut the cabinet and raise the bottom of the cabinet and cut the door to fit . Now for the vent need a photo of the entire kitchen.
that HAS TO BE A COMPLETE NIGHTMARE TO STIR ANYTHING ON THE BACK BURNERS. sorry for caps. and you have gas open flames at 12 inch that's a bit to close. I'd remove the microwave until you get a plan as to how to resolve the issues. is the tile running behind the microwave?
 

addy1

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Take some pics of your entire kitchen with the outside wall labeled. Got some brilliant people on this forum, well at least helpful!
 

addy1

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Ha! Sometimes us guys don't see things that are right in our faces! It's a guy thing!
SOMETIMES? How about all of the time. I can tell him what cabinet, what shelf, what side, color and he still can not find the item.
 
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Whoever decided to make a microwave that also functions as a hood vent was a moron. That was our old kitchen set up and it was terrible - the vent was useless and we burned out half a dozen microwaves because electrical components do NOT like heat. Not to mention, reaching over a hot pot on a stove to get something out of the microwave is hardly safe or ideal. We learned (after microwave number three) that they had installed ours too close to the stovetop (voiding any warranty on the MW of course) but honestly any higher and I wouldn't have been able to safely get anything hot out of it - and I'm NOT a shorty! And of course, once they build it that way you're stuck until you remodel.

Good luck @Mmathis - I added zero to the solution. Just commiserating!
 

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