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i am new to the board and have just started learning about prepping and everything but i was wandering if you build an underground fallout shelter or whatever you want to call it. how do you oxygen to breath. I dont know if im thinking to much into it or what.
 

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Wine cellar, play room, sewing room, store room, multi-purpose room, game room. Just a few possibilities.

As to the ventilation, you must put in a manual/12v blower system with appropriate intakes and exhausts to maintain a fresh air atmosphere inside the shelter.

Keep looking around here. There are several threads on the subject.
 

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It would depend on how many people & pets are in the shelter. Also, how tight the entrance door is. If there is an open flame, that will make a difference also.

You could put a 6" PVC pipe through the ceiling and put the bottom close to the floor for the intake. For the exhaust, use 8, 10, or 12" PVC in the opposite corner of shelter with the pipe close to the ceiling. Paint the exhaust pipe black and wrap it with clear corrgated fiberglass. During the day, the heated large exhaust pipe will draw air out and let the fresh air in. During the night, use a 12V fan from a battery that was on a solar charger.

Do a search on bunkers. There is a lot of information on the forum about them.
The attic spinner fans could be used also.
 
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