I get asked this question frequently and this is a tricky one. The Havsta does not sit flush to the wall because it has a kick plate trim. To avoid a gap between the unit and your wall, you have two options. Firstly, you could remove the baseboards on your wall and resize them to allow the Havsta to slide in flush. Secondly, you can purchase additional trim to glue or nail to the edges of your Havsta where it meets the wall. We chose not to do either and it's fine, but if you are fussy, you'll want to consider that there will be a gap unless you address it.