Chemical & Biological Protection'All Hazard' Shelters must be protected against the intrusion from chemical/biological war gasses. Gas tight doors and blast valves provide a slightly positive air pressure, as outside air enters the shelter and is filtered though the gas filter. This positive pressure holds un-filtered air from intruding into the shelter. This filtration process is standard with all shelters from Utah Shelter Systems.
People requiring tornado and hurricane shelters, only, may wish to purchase the ventilator without the addition of the gas filter. Call us for pricing on this option.
Some people wish to have an 'air lock' option. An air lock is a preliminary room used for entering and exiting the main shelter without contaminating the shelter room with outside air. See the section marked AIR LOCKS for design information.
Learn about our chemical and biological filters.