What is a retrofit requirement under the Ontario Fire Code for homes with fuel burning appliances?

The correct answer highlights the critical safety measure for homes equipped with fuel-burning appliances, which is the installation of a carbon monoxide alarm outside of bedroom areas on every level. This requirement is essential because fuel-burning appliances can produce carbon monoxide, a colorless and odorless gas that poses serious health risks. By having alarms installed in key areas, it ensures that residents are alerted to the presence of this dangerous gas, allowing for timely action to safeguard their health and safety.

The other options do touch on important safety devices, but they do not specifically address the unique risks associated with fuel-burning appliances as defined by the Ontario Fire Code. Smoke alarms and sprinkler systems are vital for fire safety but do not provide the necessary measures against carbon monoxide exposure, which is directly linked to the use of fuel-burning appliances.