What you can't do is allow for ethylene to build up or stagnate around your buds. At all. Whatsoever. Not understanding the why's and wherefore's of ethylene, you're left relying on blind luck.
It's the plants "death breath". Without looking at the specs, I think it becomes toxic around 50 ppm to your plants and will ruin your harvest in a matter of hours.
I do a rough wet trim to eliminate as much plant matter, and thereby, as much ethylene buildup as I can from the drying equation before racking my buds up on stainless steel racks in a tall, narrow, continuously exhausted cabinet. I throw all the wet stems and water leaves into the fireplace. If I wanted to keep them, I would dry them way the hell away from my dry and my grow.
I dry about a # at a time (no fans or stems) in a small climate controlled 9x11 office without worrying about the ethylene building up to toxic levels. I open the door briefly to enter the room to check that the exhaust fan is still alive every couple of days and that's that. Keep a spare exhaust fan and a backup power supply on hand at all times. Unvented pot very quickly becomes gross stagnant hay.
And as tempting as it seems, please don't point a fan at your buds. Keep things nice and evenly aerobic by keeping everything under constant gentle negative pressure in something taller and narrower like a flue to ensure the air and gasses flow up-through and out-of the cab all nice and even-like.
Sorry if I broke some unspoken rules here. I've been on and off of the forums for 20 years and never really saw it typed out like that in plain English, and understandably so, considering ya know, capitalism and stuff.
Do your ethylene research. My shoulder is giving out.
A $300 donation can be made to St. Judes Hospital in lieu of my consultation fee.