On category IV appliances, can a single wall vent be used to vent flue gases?

In the context of category IV appliances, utilizing a single wall vent to vent flue gases is not permissible due to specific venting requirements and safety standards. Category IV appliances are designed to operate with positive vent pressure and typically require either double-wall or special venting systems that are capable of safely handling the high efficiency and condensation produced during operation.

Single wall vents lack the necessary insulation and structural integrity to manage the flue gases effectively, which can result in a risk of overheating and potentially hazardous conditions, such as flue gas leaks or improper draft. Thus, the requirement for more robust venting systems ensures both the safety and compliance with applicable codes and standards related to appliance installation and operation.

This compliance is critical to ensure effective venting and to minimize environmental impact, thus adhering to the safety protocols established by regulatory bodies like TSSA. Therefore, a single wall vent cannot be used with these appliances under standard safety regulations, making the statement that it is not allowed accurate.