Go here:
https://www.acinfinity.com/
I’ve got a 5" side discharge on my tube pre-amp and it keeps it very cool. It has three speeds. On low you can hear it when you are next to it, but not across the room.
My SS amp has enormous heat sinks but I might put one of these on top of each one anyway.
The company makes thermostats for their fans as well.
https://www.acinfinity.com/
I’ve got a 5" side discharge on my tube pre-amp and it keeps it very cool. It has three speeds. On low you can hear it when you are next to it, but not across the room.
My SS amp has enormous heat sinks but I might put one of these on top of each one anyway.
The company makes thermostats for their fans as well.