NFPA 16: Standard for the Installation of Foam-Water Sprinkler and Foam-Water Spray Systems outlines requirements for the design, installation, and maintenance of systems for reliable fire protection. Consult the 2011 Standard for the latest on components; water supplies; design and installation; acceptance tests; and inspection, testing, and maintenance. Systems are to be designed with the required density for either foam or water application as the controlling factor, depending on the design purpose.