Quick facts about carbon monoxide
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Carbon monoxide (CO) is a colourless, odourless, and tasteless gas.
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It is produced by fuel‑burning appliances such as furnaces, stoves, fireplaces, generators, and engines.
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CO exposure can cause flu‑like symptoms; high levels can lead to loss of consciousness or death.
New Safety Requirements
Existing Homeowners
(Includes detached homes, semi‑detached homes, townhouses, and cottages)
When CO Alarms Are Required
CO alarms are required if the home has:
- A fuel‑burning appliance,
- A fireplace,
- An attached garage, or
- (Effective Jan. 1, 2026) Heating air supplied from a fuel‑burning appliance located outside the home (e.g., utility shed).
Where CO Alarms Must Be Installed
- Adjacent to each sleeping area, and
- (Effective Jan. 1, 2026) On every storey of the home, including those without bedrooms.
Responsibility
- Homeowners: Owner‑occupied homes
- Landlords: Rental properties
Existing Multi-Unit Residential Buildings
(Apartments, condos, duplexes, retirement homes, lodging/rooming houses, hotels, etc.)
Inside Residential Suites
CO alarms are required if the suite:
- Contains a fuel‑burning appliance or fireplace,
- Is adjacent to a service room or garage with a fuel‑burning appliance, or
- (Effective Jan. 1, 2026) Is heated by air from a fuel‑burning appliance outside the suite.
Placement:
- Adjacent to sleeping areas
- (Effective Jan. 1, 2026) On every storey of the suite
Common Areas
- Service rooms with fuel‑burning appliances
- (Effective Jan. 1, 2026) Public corridors heated by air from a fuel‑burning appliance
Responsibility
- Building owners (landlords for rental units)
Existing Care Occupancy Buildings
(Convalescent homes, residential care facilities, certain group homes, etc.)
Where CO Alarms Are Required
- Inside resident suites where risk conditions exist
- In service rooms and common areas with fuel‑burning appliances
Placement in suites:
- Adjacent to sleeping areas
- On every storey
Buying and Installing Your CO Alarms
Approved Alarm Types
CO alarms must display a recognized certification mark, such as:
- CSA
- ULC
- Intertek (ETL)
Permitted alarm types:
- Hardwired
- Battery‑operated
- Plug‑in
- Combination smoke/CO units
Installation & Maintenance
- Install alarms according to the manufacturer’s instructions.
- Maintain alarms in working condition and replace them as directed by the manufacturer.