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Thanks PG, I do think my OCD is kicking in, and the last time I visited the dentist he pointed several bring lights in my face and kept asking me "Is is safe?" while he drilled off half of my tooth! (If this doesn't make sense, see the movie Marathon Man it's great.
Ok, focusing on the ventilation. My air will enter at the bottom back of the cabinet through the dryer (drier?) vent. The bottom section of the cab. is 36" wide x 24" deep x 18ish" high and is covered by a shelf. I will put a 2"ish hole through here and use some PVC elbows on both sides of the shelf through the hole to make a light trap. So, light escaping from the main top part of the cab. through the dryer vent at the bottom should not be a problem. But, in the future I planned to use the bottom section as a mother chamber (sounds kind of evil!). So I guess I will get a flexi tube as you suggest for a light trap.
Do you think the 2" hole through the shelf is enough for a 90 CFM in-line fan in a 4" exhaust (with the 4" intake dryer vent) to breathe???
Second question. During the grow, do I need to have the fan run continuously or how often during a day and for what duration?
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