Every building or structure not exceeding 40
feet in height above the mean grade erected or substantially altered
to be occupied for residential purposes shall be protected throughout
with an automatic fire warning system equipped with automatic smoke
detection devices or automatic smoke and heat detection devices primarily
intended for the protection of life by indication of abnormal conditions
as hereinafter provided, except that the installation of such automatic
fire warning systems shall not be required in buildings or structures
subject to the provisions of the general laws relative to the installation
of automatic sprinkler systems and automatic fire warning systems
connected thereto.
For buildings and structures occupied for residential
purposes not exceeding 30 feet in height above mean grade or containing
12 or fewer dwelling units, such automatic fire warning system shall
initiate the sounding of an audible alarm capable of being heard in
all occupied areas of the building or structure.
For buildings and structures occupied for residential
purposes exceeding 30 feet in height above mean grade, but not exceeding
40 feet in height above mean grade, or containing more than 12 dwelling
units, such automatic fire warning system shall initiate the sounding
of an audible alarm capable of being heard in all occupied areas of
the floor on which the alarm is initiated; and shall register the
location of the alarm at a specified location in the building or structure.