True or False: A masonry chimney can be used without a liner for gas appliances.

A masonry chimney is not suitable for use without a liner for gas appliances. The correct choice highlights the importance of having a proper flue liner in place to ensure efficient and safe venting of exhaust gases from gas appliances. A flue liner also helps to protect the masonry structure from the corrosive byproducts of combustion, which can be harmful over time. Without a liner, there are significant risks, including the potential for drafting issues that can lead to the accumulation of harmful gases, as well as increased wear on the chimney materials. Therefore, proper venting practices always necessitate the use of a liner in masonry chimneys to adhere to safety standards and manufacturer guidelines.