The holes in the PSU casing itself are probably 5mm (maybe even 5.5mm) so there are no issues fitting the larger fan screws through the PSU casing itself. One rather annoying problem is that the attachment holes on the Papst fan have a diameter of 4.3mm (+/- 0.1mm according to the datasheet (PDF)), and the supplied HP screws are closer to 4mm in diameter so they don't actually fit and cannot be used to attach the Papst - luckily I had some spare fan screws available with a larger diameter (about 4.5mm) and that sorted it. The fan seems to push a decent amount of air, though it's not exactly the quietest fan in the world so I attached it to a Zalman Fanmate fan controller to slow it down a bit and make it silent - I reckon it will still move enough air to keep the PSU in the N36L comfortable. I'd be surprised if the original fan ran at the full bore 7000RPM and would expect it to have been under-volted at 7V or maybe even 5V so probably isn't pushing the rated volume of air, in which case a slowed-down Papst is probably still a reasonable match for the original fan. The Papst 412 fan arrived from Farnell today and as expected there is no motherboard fan connector attached so I soldered on a spare 3-pin fan connector so that I could connect it to the P6 (ODD) 4-pin Molex plug (using a 3-pin to 4-pin adapter, of course). The HP PSU fan power connector is a 4mm mini-Molex which is pretty rare so I could either solder the original connector to the Papst and keep the cabling entirely within the PSU casing, or alternatively attach a standard 3-pin fan connector to the Papst and run the cable outside of the PSU to one of the spare Molex power connectors using a 3-pin-to-4-pin adapter (which is what I did). The HP original PSU fan is a T&T 4020HH12S-ND1 (40x40x20mm 12V DC sleeve bearing, 7000RPM, 8.36CFM, 31.9dBA) and I settled on this EBM Papst 412 (6000RPM, 5.9CFM, 18dBA) from Farnell in the UK. Edit: Ooops - just realised I posted this to entirely the wrong forum! To fill in the blanks - the fan in my N36L PSU began making grinding noises after 15 months so I searched for a replacement.
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