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Trying to compare the difference between the NSSA certification Tornado Alley Armor Safe Rooms has and the ATSA certification seen on other tornado shelters and storm shelters?

Trying to compare the difference between the NSSA certification Tornado Alley Armor Safe Rooms has and the ATSA certification seen on other tornado shelters and storm shelters?

 I'm trying to compare the difference between the NSSA - National Storm Shelter Association- certification you have and the ATSA - American Tornado Shelter Association- certification I have seen on other safe rooms. Can you explain the differences? The National...

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