What can occur if a gas appliance is not vented properly?

When a gas appliance is not vented properly, the risk of explosion significantly increases. This is primarily due to the accumulation of flue gases, which contain harmful substances such as carbon monoxide as well as unburned gas that may ignite if a spark or flame is present. Proper venting systems are designed to safely direct these gases outside the living space, preventing dangerous concentrations that could lead to backdrafting or even an explosion if the conditions are right.

Inadequate venting can also lead to a failure in the operation of the appliance, such as incomplete combustion, which can produce excessive heat and lead to further risks. Safe venting practices help ensure that gas appliances function efficiently and do not pose a danger to those using them.