ESP Safety Shelters (above-ground only) offer the ultimate in multi-purpose protection and security for you and loved ones against violent acts of nature and multiple threats posed by man. This shelter will withstand the most extreme tornado activity and offer a safe zone against home invasion. It is preferable for the shelter to be installed within the interior of a residence. If you choose to install it outdoors, it must be within 150 feet of the residence it is intended to serve and must be protected from all external weather conditions. THIS SHELTER IS NOT WATERPROOF. The shelter has undergone and passed testing at the National Wind Institute at Texas Tech University. It has been tested and withstood a total of nine impacts from 15 lb. 2x4s traveling at 100 mph. These impacts are equivalent to the force produced by an F5 tornado with 250mph winds. All ESP Safety Shelters have been verified by the National Storm Shelter Association (NSSA) to be in compliance with FEMA 320, FEMA 361 and the ICC-500-2014 Code requirements when installed per the manufacturer's guidelines and inspected by a qualified inspector. Installation checklists and inspection checklists are provided. All shelters have been designed by Registered Structural Engineers and have undergone a rigorous 3rd party review process. Near Absolute Protection definition from FEMA P-361: Level of protection afforded to the occupants of a safe room built according to the guidance in the most current edition of FEMA P-361. Our current knowledge of tornadoes and hurricanes indicates that safe room occupants will have a very high probability of being protected from injury or death. These shelters are designed to be a DIY project, but once the shelter installation is completed, it must be inspected by a qualified inspector. Contact your local building inspector or find an engineer or architect in your area. Visit www.nssa.cc to find a pre-approved list of installation companies. The NSSA type 4 seal will provide a warranty after the installation check list and final inspection checklist are complete and sent to the manufacturer. The NSSA type 4 seal and a Certificate of Installation will be sent to customers after the manufacturer has received the installation checklist and final inspection checklist. The Limited Lifetime Storm Damage Replacement Benefit does require that all installation procedures be followed and documented proof must be submitted to the manufacturer.5 Year Limited Warranty