I've installed a number of Stainless Steel OTR's from various manufacturers (Frigidaire, Whirlpool, Electrolux, KitchenAid) and all of them were shipped with the ability to be set up to either vent internally or externally.
I've not yet run across a situation where I had to replace an OTR that was externally exhausted, so I can not advise on what is entailed with modifications, or extra parts that may be needed, to adapt to an existing external vent.
8 years, 10 months ago
by
TekToyJunkie
Prior Lake, MN