It's usually a building code thing. In Massachusetts, if you're in a one- or two-family dwelling, the reg is 780 CMR 3603.16 (http://www.mass.gov/bbrs/780CMR_Ch3603.pdf) (starting on page 21 of the linked doc). If you're in an apartment, you want 780 CMR 919 (http://www.mass.gov/bbrs/780CMR_Ch09.pdf) (start on page 34). At least one in each bedroom, at least one per storey of a dwelling unit, plus other obvious locations. They must be AC-powered with battery backup. Note that it is the owner's responsibility, emphasis theirs, to make sure the system is regularly checked (not to mention exists).
Lots of other interesting reading too, if you're into that sort of thing.
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Date: 2004-09-13 11:56 pm (UTC)Lots of other interesting reading too, if you're into that sort of thing.