Thanks for the replies
Yes, the 'cooler' will be for my receiver. The clearance in the cabinet is rather tight. I've seen commercial products that do the same but cost $100+ so thought to make something myself for fraction of the cost.
Essentially, I'm looking for a case, a low profile one, around an inch high, that will house three fans, and is about the length and width of a typical audio equipment so I can rest the audio receiver on top of this case.
The fans will be blowing air into it from the bottom.
I thought about gutting out a cheapie $25 DVD player, using its housing and mounting the fans in it, THEN placing that under the receiver ?
Some of these DVD / CD player are pretty low profile, they are about an inch (even less ) thick.....