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I have read this very helpful thread on fan mods of FLEX ATX PSUs, and I am thinking to replace the stock 40mm fan with a much larger, centrifugal fan, rather than top-mount. In your experience, which FLEX ATX PSUs in the 350W+ range is most permissive to modding (solid build, screws rather than rivets, materials, pinouts, etc)? Would you recommend using a 1U server PSU instead?

What I have in mind is to duct a 120 mm (i.e. large diameter, low max RPM) centrifugal blower, mounted next to (rather than on top) of the PSU. This (I hope) would allow me to keep the build within the 40 mm height, while reducing the noise. The geometry of a centrifugal blower (i.e. small diam output) seems adapted well for coupling into the (small-diam) 40 mm input of the original 1U PSU fan. I need to make sure that the PSU controls the new beefier fan as if it was its native one (high RPMs based on load, shut-off if the fan fails etc).

E.g. this blower has 1900 max RPM:

https://www.mouser.co.uk/datasheet/2/471/San_Ace_127BJ32_E-1284333.pdf

<blockquote data-quote="runcyclexcski" data-source="post: 134676" data-attributes="member: 10967">I have read this very helpful thread on fan mods of FLEX ATX PSUs, and I am thinking to replace the stock 40mm fan with a much larger, centrifugal fan, rather than top-mount. In your experience, which FLEX ATX PSUs in the 350W+ range is most permissive to modding (solid build, screws rather than rivets, materials, pinouts, etc)? Would you recommend using a 1U server PSU instead?What I have in mind is to duct a 120 mm (i.e. large diameter, low max RPM) centrifugal blower, mounted next to (rather than on top) of the PSU. This (I hope) would allow me to keep the build within the 40 mm height, while reducing the noise. The geometry of a centrifugal blower (i.e. small diam output) seems adapted well for coupling into the (small-diam) 40 mm input of the original 1U PSU fan. I need to make sure that the PSU controls the new beefier fan as if it was its native one (high RPMs based on load, shut-off if the fan fails etc).E.g. this blower has 1900 max RPM:<a href="https://www.mouser.co.uk/datasheet/2/471/San_Ace_127BJ32_E-1284333.pdf">https://www.mouser.co.uk/datasheet/2/471/San_Ace_127BJ32_E-1284333.pdf</a></blockquote>

[QUOTE="runcyclexcski, post: 134676, member: 10967"] I have read this very helpful thread on fan mods of FLEX ATX PSUs, and I am thinking to replace the stock 40mm fan with a much larger, centrifugal fan, rather than top-mount. In your experience, which FLEX ATX PSUs in the 350W+ range is most permissive to modding (solid build, screws rather than rivets, materials, pinouts, etc)? Would you recommend using a 1U server PSU instead? What I have in mind is to duct a 120 mm (i.e. large diameter, low max RPM) centrifugal blower, mounted next to (rather than on top) of the PSU. This (I hope) would allow me to keep the build within the 40 mm height, while reducing the noise. The geometry of a centrifugal blower (i.e. small diam output) seems adapted well for coupling into the (small-diam) 40 mm input of the original 1U PSU fan. I need to make sure that the PSU controls the new beefier fan as if it was its native one (high RPMs based on load, shut-off if the fan fails etc). E.g. this blower has 1900 max RPM: [URL]https://www.mouser.co.uk/datasheet/2/471/San_Ace_127BJ32_E-1284333.pdf[/URL] [/QUOTE]

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