InstAlling duct to tent

Do I need to buy 2 flanges? One for outside and 1 for inside right? Otherwise there's nothing to connect 2 on 1 side right? Might be a tard question but seeing how you guys with tents have yours hooked up. Just got home from grow store and only bought 1 damnit. I always seem to forget something!!

Work with what you got. Usually a grow tent has "flange socks" that done require flanges to be installed you just slide the ducting through. I would reccomend a flange to your exhaust wall though to keep critters out and get a great seal

No sock , fing tent lol