The Ventline link was informative. Two things I noticed.
One is that in one product there's a choice of vent covers, one being louvers like my original. Interesting that it's still an option when the hooded grills make so much sense.
Two is that on all five examples it appears the hole in the wall is going to be too low for my app. My original hood upper surface is only 1/4" below the cabinet (as positioned by the hood flange on the top of the metal unit). These all look like a larger distance.
Thanks for the link, I'll keep an evaluation going.
