The space surrounding a chimney liner must not be used for what purpose?

The space surrounding a chimney liner must not be used to vent an appliance because the primary function of a chimney liner is to contain and direct the flue gases safely from the appliance to the outside atmosphere. Using this space for venting an appliance would compromise the effectiveness of the chimney system and could lead to unsafe conditions, such as carbon monoxide buildup or fire hazards.

A chimney liner is designed to remain clear of any obstructions and ensure that any combustion by-products are directed properly. Therefore, maintaining the integrity of the space around the liner is crucial for system efficiency and safety. Proper guidelines dictate that this space should be maintained for the sole purpose of facilitating safe exhaust from the liner rather than being repurposed for any additional functions, such as venting.