Hi there,
I'm new to the forum but have definitely been on here for help with other projects.

This may not be the appropriate section, so if that's the case, please have it reassigned.

We've installed new kitchen cabinets, floors, etc... However, haven't been able to get around to installing the OTR microwave or the cabinet that goes above it.

Prior to re-build, there was a hood fan which was hard wired. I hired a Master Electrician to remove the old aluminium wiring and install a new three-prong outlet in place where the new cabinet will go.

However, yesterday, while planning the work to be done, I realized that the existing hood fan vent is too low for the exhaust on the microwave.

If you notice in the attached picture, there is the new three-prong outlet. Just below it (maybe one inch) is where the cabinet will line up. From there, you'd attached the microwave, which has the exhaust at the top of the microwave.

I'm wondering - what options do I have, short of rebuilding a new hole for the vent?

Is it possible to cut a new vent hole into the wall and do duct work down to the existing vent, out the side? If so, would I attach vapor barrier and then insulate around the duct work, followed by gypsum board to cover the duct work and existing hole?

I've considered getting a larger cabinet, but that may make it uncomfortably close to the stove (still up to code but it would make any tall person unable to see the knobs on the stove without bending.

Any information you can provide would be appreciated.

Thanks,
Craig

 

Put some scribe lines as to where the new cabinet is to be located. If your math works out the hole you cut in the wall to raise the duct will locate itself behind both the new microwave and the cabinet so that finishing work is minimal on the drywall. You just have to close it up.

 

But my idea makes sense? I can cut a hole into the wall from where it needs to go and then add some ductwork from the microwave exhaust, in the wall and down to the existing exit hole and use vapor barrier and insulation to keep the cold from coming in? I'd then use new gypsum board and do an okay job of patching up the new work since it'll be covered by the microwave and cabinet?

If so, what kind of insulation should I use?

 

If it is an exterior wall, use the same kraft faced insulation you will find when you open up the wall. However, since the hole will be the same size just located in a different area, you should be able to just relocate the insulation that is in the wall to cover up any new area.