1.   Check chimney flues and heating equipment in summer and do maintenance, make repairs or replace an outmoded system.

2.   He described the topography as acting like a chimney flue.

3.   The chimney flue of the buidling with City Hall in the background.

4.   The only other possibility that I can think of is that the chimney flue needs repair.

5.   Water that finds its way down a chimney flue can react with acidic creosote to weaken mortar.

6.   You should never have a single chimney flue venting two fireplaces, or one fireplace and a furnace.

7.   You can test for backdrafting by holding a smoking incense stick below the chimney flue.

8.   Queen Elizabeth II grapped a soda-water dispenser to douse a fire that had begun to fill her private suite with smoke after a chimney flue blew shut.