Nice cab. Here are a couple of ideas to address airflow:

IIRC, you want the total size of your intake vent(s) to be 1.5x-2x bigger than your exhaust vent.

The intake vent(s) should be as low as possible- I actually drilled holes in the bottom of my cab, which is raised off the floor.

The exhaust vent should be as high as possible- I actually drilled the hole on the top of my cab.

Also, it is best the the intake and exhaust are on opposite sides of the cabinet to foster the most air movement and to drag the new air through as much of the cabinet as possible.

Since this is a veg cabinet and not a flowering cabinet, you may not need to worry about total darkness when the lights are off (assuming you are not going on a 24/0 light schedule). Buuuuttt... you can drill 2" holes for the intakes using a whole saw and use 2 BLACK pvc 90 degree elbows put together to form a light trap, to reduce any ambient light that may creep in (stupid sprawl and light pollution).
krustythfreakinclown Reviewed by krustythfreakinclown on . MY NEW HOMEMADE VEGCAB ello all i have built a new vegcab out of wooden boards i had lying around it took me a couple of days to build and today i attached mylar to the inside the only thing that needs doing to it now is it needs a bit of a paint on the outside and i need to sort some type of airflow out for the cab the inside is sealed and there is no light leaks i know this as i got in it and closed the doors i saw no light after i sealed the gaps ill post pics too let me know what ya think cheers all :) Rating: 5