![]() ![]() I want to be able to swap out blowers/fans easily from 115v AC to 12v DC if needed, will have large deep cell 12v dc batteries for backup power requirements. Pressure differential should overcome HEPA filter and backflow valve on outlet. Blower or fan on inside of shelter to provide positive pressure to ensure all air flows outward (no incoming unfiltered air).Įxhaust air via 4" pvc pipe with HEPA filter outside of shelter, located on top of opposite wall.īackflow valves located on inlet/outlet lines, battery powered CO2 alarms mounted in shelter.įiltered air comes in, blower or fan creates positive air pressure and freely circulates filtered air inside of shelter, then stale air exhausts due to positive pressure via outlet. Incoming air supply via 4" pvc pipe low in wall, filtered outside of shelter to remove radioactive particles using HEPA filters. Top of stairwell has bilco basement steel doors, these doors would be sealed with plastic & duct tape during fallout use, minimal air leakage. Only opening is tight fitting 36" door into stairwell area. Roof is 11" concrete slab supported by steel beams, sealed air-tight. I have a question near the bottom of this post, but here is the background information you will need to answer the question:Īll walls are concrete filled block, below grade and backfilled. ![]() Secondary use of the space is as a root cellar. ![]() I am building a fallout shelter for my family and need help with the design of the ventillation so we don't suffocate if we ever have to use it. ![]()
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