The smoke chamber is a portion of the fireplace located above the firebox and at the base of the chimney flue where smoke gathers (to create the draft) before it is exhausted up and out of the chimney

The smoktite ceramic sealant system eliminates the need to remove the damper and adjacent brickwork to make repairs, saving the homeowner hundreds of dollars in labor costs.

Tell your sweep to and insist on "Smoktite"