I have mine in a boaphile 421D (48x24x12) and he has plenty of room in my opinion. He's about 5 and a half feet to 6 feet give or take and still has enough room to maneuver. The 4' and 5' visions would have enough room, the only I don't like about them is they have a "lip" at the top of the cage above the glass doors on the inside, I've had a few of my snakes climb up there and I spent hours seaching the house for them because I thought they escaped. Not to mention I've had them fall off of there too, either way I don't think you can go wrong as long as everything is maintained. Good luck!

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