I just like it better and it has nice U shapes to hold the insulation in. I am always doing everything one man band.
Fuck building boxes and all that shit for fans what a pain in the arse, then you gotta find the room for it inside. Better to just make the room soundproof. I have multiple recirculating systems going at once. In the middle of the night when it is silent, if I stand at the door and listen and the tray is draining waterfall in the veg tray just inside the door I can hear it. But I have close neighbours all around me and there is no way they can hear a thing not even close.