I've never set up anything this elaborate but routing the cold air return thru your equipment rack doesn't sound like the best way to get air circulating in there. Given how often I have to change the filters in my house, I think a ton of dust would get thru and settle on the gear.

Does you equipment rack open up into a space behind? Maybe just a couple small muffin fans strategically placed would be all you need. I'm amazed at how cool my Pioneer A/V runs. The only thing that gets appreciably hot is the DirecTV receiver so I have it on a shelf by itself.

-Brian


2xM60ti, 2xM3ti, 2xQS4, VP100, EP350, N2's