The F5 Storm Shelter PLUS line is the top of the line storm shelter. Our PLUS line shelters are a leader in the industry. Engineered to withstand 250 MPH plus winds with added extras like bullet proof glass, heavy duty bolt system and our extra strong shelter design. Many use our PLUS line to double as a safe room. Our shelters are completely fabricated from steel and fully coated with up to 100 year plus rust protection. F5 Storm Shelters, Inc. has engineered and tested an all steel storm shelter capable of withstanding a category F5 tornado. An F5 Storm Shelter also has a fully integrated shelving system and up to five times more ventilation than our competitors.