Night of the Comet/Fridge

Fridge Brilliance

 * Why would the fact that the ventilation fans were on with the shafts open make a difference for the bad guys? It's not like a garden shed, big rig, or a projection booth are exactly the most airtight places either. Aha! While not airtight, the air inside is stagnant. The comet must have put a short-lived pathogen in the air in addition to whatever it was that steel stopped.

Fridge Logic

 * Why do they have guards posted when their installation on a now depopulated planet is so far out in the desert you need a helicopter to get there?