What maintenance step should be taken for combustion appliances?

Regular inspection of flue and venting systems for blockages is crucial for combustion appliances because these components are essential for ensuring that exhaust gases are safely expelled from the appliance to the outside environment. If the flue or venting system becomes blocked, it can lead to dangerous conditions such as carbon monoxide buildup inside the home, which poses serious health risks.

Additionally, flue and venting systems are designed to facilitate the proper flow of combustion gases, and blockages can impact the efficiency and performance of the appliance. Therefore, conducting regular inspections helps identify and rectify any potential issues before they escalate into hazardous situations.

The other options, while important for overall appliance maintenance, do not specifically address the critical safety aspect associated with combustion appliances that is directly related to flue and venting systems.