Ductless downdraft vent for island cooktop

It won't work like an actual ducted vent. The vent less basically uses an air filter and the recirculates the air back into the kitchen. It is up to you which option you choose and for you probably the non ducted route is best. Keep in mind more maintenance will be required, such as changing air filters (which isn't difficult). Also, it won't work as efficiently as a ducted vent, but should get the job done in a residential application.

I have only worked with commercial products mostly, but I would assume you would be fine.

Why not a hood??

Is this new construction or existing? If new, save yourself the aggravation and go thru the slab. If existing your limited to a hood which Im guessing is going to block your view. The ventless will be "ok" at best.

Well with an open floor plan we are trying to keep it "open".

And yes this is new construction.

I was originally going to use the vent through the slab but a friend of a friend is trying to discourage it.

Running a vent line through the slab is not that big of deal for new construction. Hoods are much better, but I wouldnt go ductless.

I HATE my ductless vent. The best thing I ever did was start my outdoor kitchen. I'm almost done with it and I dont see me using the indoor kitchen for much after that point. Pretty much the only time I cook inside now is for breakfast.