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​​​​The following information is taken fro mthe Ontario Fire Code (e-laws) 
Note: On October 15, 2014, Part 2 is amended by adding the following Section: (See: O. Reg.194/14, ss. 6, 12)
2015 Fire Code Compendium

Section 2.16  Installation of Carbon Monoxide Fire Alarms 

Subsection 2.16.1.  Application and Responsibility

Application​

2.16.1.1.  (1)  Subject to Sentence (2), this Section applies to every building that contains a residential occupancy and

(a) a fuel-burning appliance,
(b) a fireplace, or
(c) a storage garage.
(2)  This Section applies
(a) as of April 15, 2015, in the case of buildings that contain no more than six suites of residential occupancy, and
(b) as of October 15, 2015, in the case of buildings that contain more than six suites of residential occupancy.

Landlord is responsible​

2.16.1.2.  Despite the definition of owner in Article 1.4.1.2. of Division A, in the case of a rental dwelling unit, including a rental dwelling unit subject to Section 9.8, only the landlord shall be considered to be the owner for the purpose of applying Article 1.2.1.1. of Division A to this Section.

Subsection 2.16.2.  Installation Requirements

Installation requirements

2.16.2.1.  (1)  If a fuel-burning appliance or a fireplace is installed in a suite of residential occupancy, a carbon monoxide alarm shall be installed adjacent to each sleeping area in the suite.

(2)  If a fuel-burning appliance is installed in a service room that is not in a suite of residential occupancy, a carbon monoxide alarm shall be installed

(a) in the service room, and

(b) adjacent to each sleeping area in each suite of residential occupancy that has a common wall or common floor/ceiling assembly with the service room.

(3)  If a building contains a storage garage, a carbon monoxide alarm shall be installed adjacent to each sleeping area in each suite of residential occupancy that has a common wall or common floor/ceiling assembly with the storage garage.

(4)  A carbon monoxide alarm shall

(a) be permanently connected to an electrical circuit with no disconnect switch between the overcurrent device and the carbon monoxide alarm,

(b) be battery-operated, or

(c) be plugged into an electrical receptacle.

(5)  A carbon monoxide alarm shall meet the requirements of CAN/CSA-6.19, "Residential Carbon Monoxide Alarming Devices" or UL 2034, "Single and Multiple Station Carbon Monoxide Alarms".

(6)  A carbon monoxide alarm shall be mechanically fixed, attached, plugged in or placed at the manufacturer's recommended height or, if the manufacturer has not recommended a height, on or near the ceiling.

(7)  A carbon monoxide alarm that is installed adjacent to a sleeping area shall be equipped with an alarm that is audible throughout the sleeping area, even if any doors between the carbon monoxide alarm and any parts of the sleeping area are closed.

Subsection 6.3.4.  Carbon Monoxide Alarm​s — Maintenance and testing

Application

6.3.4.1.  This Subsection applies to carbon monoxide alarms in buildings containing a residential occupancy.

Landlord is responsible

6.3.4.2.  Despite the definition of owner in Article 1.4.1.2. of Division A, in the case of a rental dwelling unit, including a rental dwelling unit subject to Section 9.8, only the landlord shall be considered to be the owner for the purpose of applying Article 1.2.1.1. of Division A to this Subsection.

Duty to maintain in operating condition

6.3.4.3.  (1)  Carbon monoxide alarms shall be maintained in operating condition.
(2)  Primary and secondary power supplies that serve carbon monoxide alarms shall be maintained in operating condition.

Maintenance instructions to be given to tenant

6.3.4.4.  The landlord of each rental dwelling unit, including a rental dwelling unit subject to Section 9.8, shall give the tenant a copy of the carbon monoxide alarm manufacturer's maintenance instructions or approved alternative maintenance instructions.

Tenant to notify landlord

6.3.4.5. (1)  A tenant of a rental dwelling unit, including a rental dwelling unit subject to Section 9.8, shall notify the landlord as soon as the tenant becomes aware that
(a) a carbon monoxide alarm in the unit is disconnected,
(b) a carbon monoxide alarm in the unit is not operating, or
(c) the operation of a carbon monoxide alarm in the unit is impaired.

Disabling prohibited

6.3.4.6.  No person shall disable a carbon monoxide alarm.

Replacement in certain buildings

6.3.4.7.  (1)  Subject to Sentence (2), this Article applies to every building that contains a residential occupancy and

(a) a fuel-burning appliance,
(b) a fireplace, or
(c) a storage garage.
(2)  This Article applies

(a) as of April 15, 2015, in the case of buildings that contain no more than six suites of residential occupancy, and
(b) as of October 15, 2015, in the case of buildings that contain more than six suites of residential occupancy.
(3)  A carbon monoxide alarm shall be replaced within the time frame indicated in the manufacturer's instructions.
(4)  Despite Section 2.16, when a carbon monoxide alarm is replaced in a suite of residential occupancy constructed on or after August 6, 2001, the replacement
(a) shall not provide a lower level or type of carbon monoxide protection than that required by the building Code as it read on the day the suite was constructed, and
(b) shall comply with CAN/CSA-6.19, "Residential Carbon Monoxide Alarming Devices" or UL 2034, "Single and Multiple Station Carbon Monoxide Alarms".
(5)  When a carbon monoxide alarm is replaced in a suite of residential occupancy constructed before August 6, 2001, the replacement carbon monoxide alarm shall meet the requirements of Article 2.16.2.1.
(6) The Chief Fire Official may approve an alternative to a requirement of Sentence (4) or (5) if, in the opinion of the Chief Fire Official, the alternative provides life safety protection equivalent to or greater than the life safety protection that would be provided by the requirement.

Testing


6.3.4.8.  (1)  This Article applies to rental dwelling units, including rental dwelling units subject to Section 9.8.
(2)  The landlord shall test carbon monoxide alarms annually and after every change in tenancy.
(3)  The landlord shall test battery-operated carbon monoxide alarms after the battery is replaced.
(4)  The landlord shall test carbon monoxide alarms that are connected to an electrical circuit after any change is made to the electrical circuit.
(5)  For the purposes of Sentences (2), (3) and (4), carbon monoxide alarms shall be tested by activating the carbon monoxide alarm test feature.  


Carbon Monoxide Safety