The front half of my shed, is a 6' chain link gate, to limit access, but still allow ventilation. Turned out to be too airy, so I zip tied a tarp to it, but still have 6" below and 2' above for airflow. Have shaft collars on each gib key, but some still sticks up above the collar. Not supposed to be anyone in there anyway. Signs may get someone's curiosity aroused, so I'm not putting warning signs up.
the two barn cats have it figured out, so I hope humans can too.