This might be in the wrong section but its just a thought. Anyway, I recently started doing my first legal grow (fucking awesome by the way). I was looking at my setup today with the can-fan, carbon filter and duct taped up room and I realized that if for some crazy apocalyptic reason we got hit with a chemical or biological attack, I could just turn the fan around to blow air into the room through the filter. So while everyone else is lying emaciated in the streets, by buddies and I can chill and play cards in the room with the beautiful plants. Wow, that came across pretty morbid but hell why not?