Designed for homes, apartments, dormitories, and hotels, 5.8K Series LFII Residential Sprinklers incorporate fast response, frangible bulbs available in both 155° and 175° with ½ in. threads. Units are intended for wet pipe sprinkler systems and to protect large rooms with lower pressures. Recessed version, designed for areas with finished ceilings, employ 2-piece Style 20 Recessed Escutcheon that provides ¼ in. of recessed adjustment or up to ½ in. of total adjustment from flush ceiling position.