3.2.4.21.

(1) Smoke alarms conforming to CAN/ULC-S531, “Smoke Alarms”, shall be installed in each dwelling unit and, except for care or detention occupancies required to have a fire alarm system, in each sleeping room not within a dwelling unit.

(2) At least one smoke alarm shall be installed on each storey and mezzanine of a dwelling unit.

(3) On any storey of a dwelling unit containing sleeping rooms, a smoke alarm shall be installed in a location between the sleeping rooms and the remainder of the storey, and if the sleeping rooms are served by a hallway, the smoke alarm shall be located in the hallway.

(4) A smoke alarm shall be installed on or near the ceiling.

(5) A smoke alarm shall be installed with permanent connections to an electrical circuit and shall have no disconnect switches between the overcurrent device and the smoke alarm.

(6) If more than one smoke alarm is required in a dwelling unit, the smoke alarms shall be wired so that the actuation of one smoke alarm will cause all smoke alarms within the dwelling unit to sound.

(7) A smoke alarm required by Sentence (1) shall be installed in conformance with CAN/ULC-S553, “Installation of Smoke Alarms”.

(8) A manually operated device is permitted to be incorporated within the circuitry of a smoke alarm installed in a dwelling unit so that it will silence the signal emitted by the smoke alarm for a period of not more than 10 min, after which the smoke alarm will reset and again sound the alarm if the level of smoke in the vicinity is sufficient to reactuate the smoke alarm.

(9) The sound patterns of smoke alarms shall be significantly different from the temporal patterns of alarm signals.