Well the tent is the same as any grow, you need to control air.
There are 4 socks for air, 2 smaller ones for chords, and there are 4 intake vents, they are big rectangular with just mesh over them, so if you have a good enough exhaust it will create low pressure in the tent and pull air through the intake vents.
You will Need a centrifugal style fan. Depending on the size of tent you get, I use one on either side.
I just got 2 4inch HO centrifugals, and 2 4inch flange carbon filters. I have 2 so I can run 1 always as odor control, and the second only comes on when it gets to warm in the tent. I just used a Control Wizard cooling thermostat for that.
I do have to say I would never, ever, EVER recommend growing in an attic, thats just a bad idea, and often an amateur mistake that leads to quick failure.
But every situation is different and I dont know all the details of yours so whatever works for you.
If your attic is cool that might save on an AC, but I would imagine your going to have a Very difficult time maintaining night time temps, putting a heater in the tent wouldnt work so great, you would need to heat the whole attic to a decent temp for optimum results.
Also humidity is gonna be a HUGE factor up in an attic. I would get a humidifier up there running and and air purifier weeks before I started the grow to get a handle on temps and dust/air particles that tend to build up in attics.