by Anon-6, Survival Blog:

(Continued from Part 1. This concludes the article.)

– To filter air:

• Need to get fresh air into the shelter without pulling in fallout particles
• In rack 1 is everything you need to set up an air filter system that pulls in filtered air
• Checklist with step-by-step pictures is on the clipboard
• Instructions are also written on the plywood board that will go in the opened movie room window slot (board already has 12” holes in it for the small yellow industrial fan to pull air into the movie room through one of the furnace filters) [Rack 1 contains a small commercial ventilation fan (Vevor 12” utility blower fan), three large house furnace filters that will be used to filter air pulled into the movie from outside, a fitted plywood board that will go into the movie room subterranean window, two rolls of duct tape, and several pre-cut thick pieces of foam to ensure a tight fit]