Open batwing reflector
The ducting on top right is hanging down to show you where the exhaust is on the back wall. It's about even with the bulb, maybe a little higher
the intake is the wide black thing along the bottom left. 18in x 4in which is 72 square inches minus the louvres and spacers for passive intake. They say minimum should be 2 times the area of the exhaust which would be only 12.57 square inches.
Can't take down walls. two are exterior walls, one is the door, and the one internal wall is the divider for veg/mother/clone, plus build in really good.
Biggest issue with cool tube was the one in the kit was too long. Need to find the shortest one possible that will handle a 400w bulb
crud looks like i missed you