I just got through installing a 7 KW Briggs & Stratton NG automatic generator. Their clearances were 5 ft. on all sides and could not be put under a deck. They had a ATS that would fit inside a stud wall. Worked out great. You'll have to special order the flush cover though if you're going to install it a wall, it comes with a surface cover and the rough edges are not good around where you cut out. It just so happened that the homeowner had a "tapestry" on her wall and they wanted the panel behind it anyway. Everything else worked out great. Their generator comes already "broke in" with oil and a battery in it. You have to order the battery warmer separate though if it will operated under 32F. That cost an extra $ 200.00 where I got mine. Inspector said it was a good job [Linked Image] Steve