That was a common layout several decades ago. I would be inclined to do do a major re-arrangement, but I would be doing most of the work myself and I would have to consider budget, as well. We work with the budgets and spaces we have. I'll offer some considerations about the existing space and the questions you asked. Is 17.5" too close for an OTR over a gas range? No. People put all kinds of gas ranges beneath OTRs including "pro-style" ranges. There's a photo of one over an NXR in the discussion that I've linked below. Note that the base of this one was only about 4" higher than yours -- maybe 22" above the range. While your OTR could be easily (well, relatively easily) vented to the outside, swapping in a higher powered gas range presents a couple of things to think about. One concern is "coverage." It isn't very good with an OTR. Basically, an OTR is mostly venting just the two back burners. This is not a fire hazard concern but, rather, an annoyance, It means more heat and more goo in the kitchen than with a dedicated vent hood. The other concern with OTRs over gas ranges is a suspicion that waste heat from a gas stove may contribute to eventual failure of the microwave part of the unit. Frankly, though, microwaves are such a commodity product these days and often so cheaply made that it can be hard to determine how much havinga gas range contributed to or accelerated a failure. Also, consider how often you will be using all the gas burners on the range on full power at the same time. Also, you don't avoid waste-heat problems by going with a radiant electric stove. They just make somewhat less waste heat, but not hugely so. IIRC, radiant smoothtops put 50% to 55% of their energy into pans, so roughly half of the energy can go into the room as waste heat. . With gas ranges, the rating is 33% to 40% going to pans. That's about a 20% difference, which is not huge. Coil burners are closer to 70% to 75% of energy going into pans and induction is rated at 85% to 90%. The latter differences are significant and may affect your planning about what to do with your kitchen and range replacement choices. The 30" height-above-the-stove recommendation for hoods is mainly to get them out of the way so cooks don't bang their heads when leaning over to stir or look into a pot. Another consideration that may affect your planning is that In your current kitchen layout, a hood is going to project out at least another 10 to 14 inches fruther from the cabinets. In the present location, that that could crowd (or seem to crowd) into the space expectations of folks using the sink. You can get a relatively shallow venting appliance --- can we really call them hoods if they don't have a canopy? --- which may mitigate the distance from stovetop to hood/vent somewhat. Not ideal, but workable. For example, my old house kitchen layout is such that I went with a 5" tall Zephyr hood. There is another 30" minimum clearance requirement that sometimes gets confused or mixed in to these discussions. That is for when you don't have a hood, and then the unobstructed distance above the range to flammable upper cabinet bases is generally specified as being at least 30 inches. An OTR or range hood are regarded as non-flammable surfaces so they can be closer. If you swap in a hood, what to do about a microwave? Apparently, you use the convection features a fair amount? (Otherwise, I'd suggest a cabinet hung MW unit elsewhere in the kitchen.) Do you have room for a cart someplace to hold that GE convection mw? Is there any kind of a pantry space where you could put it? If not, then maybe you just vent the existing one to the outdoors. Then give your self some time to plan and budget for a more extensive revamp. Here is a link that might be useful: Thread with photo of Nunyabiz's OTR

A real hood, mounted under-cabinet, will surely be better than an OTR microwave oven attempting to perform kitchen ventilation. A real hood rated at 400 CFM, and not too restricted by the house's ability to provide MUA, given short duct to outside without too many bends, might flow 250 - 300 CFM. I am confidant that any microwave oven claimed to be 400 CFM is actually just a 400 CFM in open air fan buried in the MW's tortuous duct path. I'd be surprised if it could flow even 200 CFM net. Note that the 400 CFM MUA rule is for hoods ducted outside; if a filtered (surely) recirculating hood were used, there is no MUA issue. VaH make an expensive but reportedly adequate for real cooking ARS recirculating hood. It might not fit your circumstances. ralph_zone8_ncwrote: "I agree the microvisor is just an eyebrow but wouldn't it block the air from going up to the ceiling and surrounding cabinets and if I turn the vent of the microwave to pull air, wouldnt it be able to capture some of the air?" With respect to eyebrow capture, it will (temporarily*) capture any part of the cooking plumes that strike it. However, they will reflect out again into the room if the blower flow rate is not high enough. Flow rate needed to assure successful capture and containment depends on the temperature of the grease being vaporized and the area over which the grease plume is being generated and whether combustion products are entrained. I recommend for most a value of 90 ft/min under the entire hood aperture when cooking with gas. This corresponds to 90 CFM per square foot of aperture. The value 60 may suffice if an induction cooktop is being used. But please note from the Figure 4 table on page 9 of Greenheck's guide -- your needed (or at least recommended) flow rate (CFM) may vary. http://www.greenheck.com/media/pdf/otherinfo/KVSApplDesign_catalog.pdf ----- *Because this eyebrow has minimal depth, the blower flow rate in its vicinity will be less than the average over the capture area. Reflection, at least of hot grease vapor may be insurmountable with a microwave oven fan system. Water vapor might be adequately dealt with if it makes it that high.

I wish I could do a good vent and the micro some place else but due to space constraints it's not possible. My old GE Spacemaker was loud too. I hate that! It's a ridiculous amount of noise these things make. It didn't seem to do a great job either but the vent hookup behind the wall was faulty horrible as we have found out. My folks have a GE and their house smells when cooking and it's loud as the dickens too. Both units have vent to the outside. Theirs even runs directly out the back through the wall, no run. I would probably venture into speed cook but plan to mostly use it for convection only mode. The baking and roasting features interest me the most. If the quality of that isn't so great, I probably wouldn't use it much so want to steer from claims that don't really deliver. I probably will continue to do microwaving on quick frozen meals. A mix of scratch and frozen foods is what I'm planning for. Economical use of a smaller oven than that on the range. I'm not sure what I'm paying for with the extra $200+. The other unit I'm looking at is a Whirlpool true convection 1.8 which claims to roast and bake. It has a 4 speed fan. The steaming feature is good for me too. The Advantium says: Speedcook; Microwave Convection Bake Broil Warm Proof Toast I'd expect steams too although it isn't mentioned. Sounds all around functional. But could I expect the broil/toast features from any convection microwave anyway? (I don't trust sales people to give me knowledgeable or even honest answers on these things). http://www.ajmadison.com/cgi-bin/ajmadison/GMH6185XVQ.html So, does the Advantium cooking quality taste better for some reason? Or convection out of one or the other runs about the same? Both will brown nicely. I love browned and crispy foods!

3.) Speaking of noise... a smaller blower working at its top speed is going to be louder than a larger blower working at a fraction of its power. For example, let's say you need 300 CFM of airflow, for your particular cooking situation. A 300-CFM OTR at full blast is going to be noisier than a 900-CFM hood running at 1/3 of its speed - typically 2 to 3 times louder! According to customer feedback, the #1 reason for upgrading from an OTR to a full-size hood is - noise! What's the point of having an appliance when you don't ever want to use it because it's too loud?