There's no room internally for a filter on the right side.Aren't there 2 sides though with mesh panels?
Ironically, it looks like it won't even fit in the M1, at least not with the stock mounting. It overhangs the front and top edges of the motherboard too much. Not that you'd want to use it anyway; it's a safe bet pretty much any regular 120mm AIO will perform better, as well as many air coolers. This cooler is really only useful for cases where the max cooler height is <90mm, and that can't otherwise use a standard AIO.Nice. Corsair just released this: http://www.corsair.com/en-us/hydro-series-h5-sf-low-profile-liquid-cpu-cooler
Curious how it performs. If it's quiet I might use it.