Dry Head
A sprinkler secured in an extension nipple that has a seal at the inlet end to prevent water from entering the nipple until the sprinkler operates.
Sidewall
A sprinkler having deflectors that are designed to discharge most of the water away from the nearby wall in a pattern resembling one-quarter of a sphere.
Upright
A sprinkler designed to be installed in such a way that the water spray is directed upwards against the deflector arcing downward in an umbrella pattern.
Semi-Recessed
A sprinkler in which all or part of the body, other than the shank thread, is mounted within a recessed housing.
Concealed
A recessed sprinkler concealed above ceilings by a cover place.
CMSA – Control Mode Specific Application
A type of spray sprinkler that is capable of producing characteristic large water droplets and is listed for its capability to provide fire control of specific high-challange fire hazards.
ESFR – Early Suppression Fast Response
A type of fast-responce sprinkler that is listed for its capability to provide fire suppression to specific high-challange fire hazards.
