It depends. In my 100 year old home it involved cut a hole in the side of the house, run 2 foot of duct, add hooded vent cover, caulk, done. It was certainly ch

It depends. In my 100 year old home it involved cut a hole in the side of the house, run 2 foot of duct, add hooded vent cover, caulk, done. It was certainly cheaper than the extractor hood/microwave the previous owners installed and foolishly didn’t vent. But it can vary, and some might care about hiding the duct with a little box or something, or painting, which I didn’t bother with.