I think I will build the height ext cube and redo the box while the plants are so young. I have a small working veg shelf cab combo that I have next to grow box to house them for the day and have the wood in garage so its just coming down to being lazy lol. I am really not good at tools or spelling so whoever said growing leads to carpentry was right. is it a bad idea to take off the inline duct to the hood so it extracts the heat from cab? i thought with moist air it would be bad and it didn't make sense.

The fans I am using have cfm ratings of 250cfm for box fresh air intake, and 80cfm for air cooled hood. I was trying for a neg air system not sure I have it down pat but I still have to add my little heavy duty oscillating fan to move the air in the box that should really help my temps when lights are on. Should I not even use intake fan when lights are off to conserve temp that would remain in box? I am going to probable run flex tubing to one of the heat ducts down to the boxes fresh air duct..

Also any thoughts on using fert/nutes within three wk stage of growth? The foxfarm ocean soil mentions not having to for 30days but I read people doing things different, is it not recommended or just listen to the plants?