29 seems low but without grabbing a server and measuring one I can't be 100% sure. 1u is about 1.75inches or 44.45 so after sheet metal and the pcb you'll have less than 40 though now that I start adding it upCurrent heatsink is 26.5mm in height, seems the absolute limit for 1U is 29mm (according to Scythe Kozuti Low Profile CPU Heatsink | silentpcreview.com) in height so sadly that one is too high Thanks for mentioning it though.