These requirements cover foam producing equipment and liquid concentrates employed for the production and discharge of foam that has an expansion ratio of 20:1 or less and is used for fire extinguishment. These requirements are based on the premise that foam equipment and specified types of foam liquid concentrates with which they are intended to be used are to be investigated for use with each other. If foam equipment covered by these requirements incorporate sprinklers@ the sprinklers shall comply with the Standard for Automatic Sprinklers for Fire Protection Service@ UL 199. Requirements for the installation and use of foam equipment and liquid concentrates are included in the following standards of the National Fire Protection Association: a) Low Expansion Foam and Combined Agent Systems@ NFPA 11; b) Deluge Foam-Water Sprinkler and Spray Systems@ NFPA 16; c) Installation of Closed-Head Foam-Water Sprinkler Systems@ NFPA 16A.