FEMA P-361 are the published guidelines by the Federal Emergency Management Agency for constructing tornado safe rooms for communities and residences. It provides guidance in qualifying, constructing, and managing these structures. FEMA offers grants to communities and schools at-risk areas for tornadoes to build safe-rooms that meet FEMA P-361 guidelines.
The Federal Emergency Management Agency does not endorse any construction method nor any company that builds P-361 qualified structures. The guidelines are merely the standard by which these buildings must meet.