Indiana Code Title 22. Labor and Safety § 22-11-18-3

Sec. 3. (a) This section only applies to hotels and motels.

(b) All hotels and motels must have functional smoke detectors.

(c) Except as provided in subsection (f), a detector must be installed in all interior corridors adjacent to sleeping rooms and must be spaced no farther apart than thirty (30) feet on center, or more than fifteen (15) feet from any wall.

(d) The detectors must be hard wired into a building's electrical system, except as provided in subsection (f).

(e) The detectors must be wired in a manner that activates all the devices in a corridor when one (1) is activated, except as provided in subsection (f).

(f) All single level dwellings, all seasonably   1 occupied dwellings, and all hotels and motels with twelve (12) sleeping rooms or less (and containing no interior corridors) are exempt from the requirements of subsections (c), (d), and (e).  In all such units:

If a battery operated detector is installed, it must contain a tamper resistant cover to protect the batteries.  The fire marshal shall adopt rules detailing the specifications for the tamper resistant cover.  If a battery operated detector is not installed, the detector must be hard wired into a building's electrical system.