How is your input/output air setup with closet LED's?

I have seen and read plenty about everyone's lighting setup, but don't ever seem to see how anyone's input/output of their air ventilation is setup for a closet grow.

Would anyone mind sharing their take on air circulation for a closet grow? I am a new grower just about ready to pull the trigger on a 240 Watt Blackstar. The only thing that is really holding me up is figuring out how to setup a noninvasive ventilation system in my closet. It just doesn't seem like I can without knocking holes in the ceiling and placing inline fans in the attic.

Any suggestions?

Thqnks again,
Jixan

Does this help?

It does, thank you for posting the illustration Moebius.

I would also love to see some real life setups as well if anyone wouldn't mind. I suppose that I need to make the decision to grow in a tent or just the closet itself. I have been aiming to grow just in the closet because it would save me the expense of a grow tent, but with a tent I would have less cubic feet to worry about. The only other concern I have at the moment is heat, I love that the Blackstar will be much cooler than a HPS or MH. Although I am still worried about the closet temperature itself. It got into the high 80's during the hottest time of the summer last year. Oklahoma had a real doozie of a hot streak last summer 40+ days of 100+ weather. I suppose that keeping the door open would elevate that concern. Excuse me, I'm rambling now.

Thanks again, I would love to see everyone's closet grow tents if that would like to post pics. Thanks!