Originally Posted by borax
Guys what is the maximum thickness of rad i can put at the top of the case in push pull, Triple 360mm?
Short answer: A 45mm thick 120-series rad like a 360 or 480 in push-pull with 25mm thick fans will extend down to even with the top of a mobo, but also will be ~54mm offset from the mobo so as long as you don't have anything taller than ~54mm on your mobo, like heatsinks or ram, etc, it's possible that you can get away with an even thicker rad, a 60mm or an 80mm thick monsta even, if you don't mind the rad & fans overhanging the mobo.
Rather than reinvent the wheel, here's a more extensive recent reply to someone else where I'm referencing a 480 rad, but all the same clearance issues also apply to a 360 rad too except a 360 won't affect the front 5.25" drive bays like a 480 might.
Originally Posted by Unicr0nhunter
I have a 480 XT45 in the roof in push-pull.
There is 70 mm of clearance from the top of the mobo to the inside top of the case, so an Xt45 with push fan (45mm + 25mm) comes just even with the top of the mobo. A 45mm thick rad with 25mm push fan will fit perfect with any
motherboard because 120mm-series rad/fan mounts are also offset by ~54 mm (140mm series fans/rads are offset by ~44mm).
With that offset, as long as you don't have anything on your mobo taller than ~54mm, you can run even thicker rads in push pull.
Do note that you will pretty much lose the use of your top 5.25" bay with a 45mm 480 with push fans.
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FYI, most of these type questions have been answered by Jesse over at themodzoo: