If it’s for two plants I’d go with 2x4, and you can turn that into a veg tent later on. Then I’d get a 4x4 for flower. I vent inside through a phresh filter, and you can never smell anything in my house. Temps get high somtimes, but I leave the window cracked in an adjacent room with a fan blowing the new colder air into my room. Works like a champ.
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