Can I vent a microwave vent / range hood through wall?
There is no standard mounting or vent hole dimensions for these type of microwaves. Although most of them adapt to 4inch vent hose, there is no standard to where on the back of the microwave the vent is attached, and this can effect where you need to cut your hole in the wall, especially in 2X4 walls where you won't have a lot of room to offset the vent.