What is a major concern when using an induced draft motor concerning vent size?

The major concern when using an induced draft motor with regard to vent size is the risk of pressurization. An induced draft motor helps to remove flue gases from a heating appliance and ensures that the combustion process operates efficiently. If the vent size is not properly matched to the capacity of the induced draft motor, it can create a situation where there is excessive back pressure within the venting system.

When the vent is too small, this can lead to an increase in pressure inside the flue, which could potentially cause flue gas spillage, backdrafting, or even improper combustion. This not only compromises the safety of the heating system but can also lead to the release of harmful gases into the living space, posing serious health risks. Therefore, ensuring that the vent size is appropriately sized relative to the motor's capabilities is crucial for maintaining safe operation and high efficiency in gas and oil heating systems.