What type of fire alarm device?
Smoke detectors don't work there very well because of the humidity and chlorine. A weatherproof heat detector might be ok but needs to be spaced per NFPA 72 and its listing. Spacing will need to be reduced per NFPA 72 for ceiling heights over 10?. Generally a fixed temperature heat detector is spaced at 25 -30 feet on a 10' ceiling and a rate of rise heat detector is spaced at 50'. The spacing is normally in the install docs.