Lennox 28J94 Flue Box Gasket

The Lennox 28J94 Flue Box Gasket is used in most of the gas-fired furnaces and boilers in homes. It is a small donut shaped seal that is placed between the flue pipe and the flue box. The flue pipe expels the combustion gases to the outside of the building and the flue box contains the burner assembly. This gasket ensures that these gases; including the dangerous carbon monoxide do not seep into your living area. A flue box gasket that has become worn out or damaged will compromise the heating efficiency, raise energy costs, and potentially even pose a risk of carbon monoxide poisoning.