1.   Also inspect the seam between the clay flue liner and the chimney and reseal with mortar or caulk as needed.

2.   A clay liner is not recommended for a gas burner.

3.   A standard clay liner is difficult to install.

4.   I asked him about the clay liner.

5.   I was told a clay liner is OK.

6.   Q. My chimney sweep told me my old clay flue liner is cracked with some holes, and suggested installing a stainless steel liner.

7.   The water vapor produced by burning gas condenses inside the flue and creates acids that can eat into the clay liner.