What is the maximum/minimum distance that the deflector will drop down below the ceiling surface when using the Model G4, G4FR, G4A or F4FR concealed sprinklers with the 1/2″ adjustable cover plate?
Reliable concealed sprinklers are designed such that the deflector will always drop below the ceiling surface to produce an unobstructed discharge pattern, as long as the cover plate and sprinkler cup assembly can be securely attached. If these two assemblies cannot be attached securely, this would indicate that the branch line is too high, or the drop nipple is too short. Installing the sprinkler in either case will result in the deflector not extending below the ceiling surface. With no adjustment of the cover plate, the sprinkler deflector will drop approximately 5/8″ below the ceiling surface; at maximum adjustment, the sprinkler deflector will drop approximately 1/8″ below the ceiling surface. The maximum ambient ceiling temperature that the sprinkler will be exposed to on a daily basis determines the appropriate sprinkler temperature rating, except where the NFPA standards may dictate the temperature rating for design considerations. Even then, one must still consider the maximum
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