Model F1Res Pendent sprinklers (Figs. 1, 2, 3 & 4) combine excellent durability, high sensitivity glass-bulb and low profile decorative design. The 3mm glass-bulb pendent sprinklers permit the efficient use of residential water supplies for sprinkler coverage in residential fire protection design. The low flow F1 Res sprinklers are specially engineered for fast thermal response to meet the sensitive fire protection application needs of the latest residential market standards (UL 1626 Standard * Upon fire conditions, rising heat causes a sprinkler’s heat-sensitive glass-bulb to shatter, releasing the waterway for water flow onto the deflector, evenly distributing the discharged water to control a fire.