Sorry about the typos! Don’t see edit button. Meant to say we’re adding a buffet under the window, and moving the pendant to be above the butcher block.

Cooking effluent plumes expand as they rise from the pan/pot that is generating them. And for gas cooktops, there is a modestly larger diameter of combustion products added on. To capture the effluent, the hood has to overlap the plumes at the height of the hood. A cylinder is the wrong shape. You need a rectangle larger than the cooktop, or, with side skirts or cabinets, side obstructions that keep the plumes from expanding outside the hood entry aperture.

Note that hoods one can stand the noise level of do not suck up the plumes, but depend on the plumes' upward momentum to bring the plumes to the hood entry. Thus one cannot depend on CFM to pull in whatever is passing the hood boundary heading for the ceiling and by diffusion to the walls, furniture, and draperies.

I can’t answer knowledgeably about the exhaust question, but wanted to say your kitchen looks great. Love it!

Lots of readers on https://retrorenovation.com had the type of fan you’re describing, I think, but I have no idea if the fans work effectively. Looks-wise it would be perfect in that space.

Kaseki, thank you so very much! This was very helpful.

Beeboo22: I appreciate your comments, as well! Will look at that site now :)

Maybe something like this that has a narrow case but a glass canopy so visually it will not conflict with the window as much:

Palimpsest, I think that’s a fabulous idea! Thank you

The glass canopy will still overlap the trim. You may need to build up the wall immediately behind the metal part of the hood to the same thickness or slightly thicker than the trim so the glass canopy clears the window trim.

The plume capture area of that glass "hood" is just the area of the mesh. Plume components hitting the glass will predominantly be reflected outward and not captured.

Maybe something with a little bit of a curve will capture a little more than flat.

Also this glass is going to get greasy and need to be cleaned a lot.

On the other hand short of either redoing your entire kitchen to move the range or bricking up the window, you are not going to get the ideal range hood with perfect characteristics over that range.

Don't let "perfect or nothing at all" mentality rule the day. Surely a range hood that captures some of the vapors is better than nothing at all.

Yes! Phew. Thank you. Especially considering we didn’t have any type of range hood for the past 9 years we lived here. Now that I’ve been reading up on all of this, I’ve learned how unhealthy that’s been. This will be a huge improvement, whatever it does!

We’re now looking at this in the marshmallow white or mint green. (Soffit built above)
https://www.homedepot.com/p/Unique-Appliances-Classic-Retro-24-in-500-CFM-Ducted-Under-Cabinet-Range-Hood-with-LED-Lighting-in-Robin-Egg-Blue-UGP-24CR-RH-RB/319120126
I want all three of you to know how much your advice is valued and appreciated.