I'm currently building a grow box out of an old speaker box. It is 3 x 1.4 x 1 ft (approx 4.2 cubic ft). I want to use a 150w HPS bulb and have the ballast on the outside of the box. The only ventilation i will be having is a 20 cfm pc fan blowing through a carbon filter. Will the heat buildup be too much to put that bulb in there? I'm only growing 2 plants.
It will definitely be too much heat if all you're using to vent is a 20cfm pc fan. It probably won't even be able to pull through a carbon filter Sent from my HTC VLE_U using Grasscity Forum mobile app
This is my first grow so give me all the critique you can, but isn't that what it should be? 4.2 cubic ft x 5 times refresh per min? Isn't that what it should be? Those open holes are all intake also but will be cover later by black screen leaning on the speaker