Okay, I understand where you're coming from. Since this box is only going to be temporary until I have time to actually design and build a more permanent drying box, I think I'll use the timer method. Like you said, I will leave a hygrometer in the card board box and manually monitor the humidity, if it goes above say 70 % I'll adjust the fan to come on more often.
Two last questions: Mold is not a problem at 75%?? Seems kinda high to me....just wanted some clarification. And finally, how long does it take to air dry your bud from cut, trim, to jars using the computer dryer?
Man, I cannot explain how grateful I am of your help screwdriver...thanks a ton!