Upright Flat Spray Sprinklers TY1146 (Model TY-FS Special) 57 K-factor are intended for installation in accordance with CEA 4001 Sprinkler Systems Planning and Installation or EN12845 Automatic Sprinkler Systems – Design, Installation and Maintenance, as applicable. They produce a flatter spray pattern than standard spray sprinklers, enabling them to be used with lower clearance above the suspended open ceilings and in racks.