grow tent size air - cooled hood help

Hey guys I wanted buy an air cooled hood but it's size is to big for my current tent, which is no big issue as I wanted buy a second tent for flowering anyway under a higher output light, my question is; Based on the Air Cooled Hoods size "Which Is" Lenth 33.30" or 2.8 feet Width 28.60" or 2.4...