In article , "Al Reynolds" ajr-
says...
Morning,

I want to put my PC in a cupboard to reduce the sound
impact of the fans. Before anyone suggests that I get
quiter fans, please bear in mind that this is a very small
form factor PC and I haven't got the time to go finding
exact match parts that will fit in its tiny case!

snip

What do people think?

Remove the existing fans and fit larger quieter ones on the outside of
the case (with suitable ducting)? Make a baffled box and line it with
sound-absorbing material?