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Manufacturers recommend annual service visits that include inspecting the flue pipe, testing furnace efficiency and adjusting the burner if necessary.

For years researchers have been working to build experimental technology that would capture CO2 from chimneys and flue pipes before it gets into the atmosphere.

If you have oil heat, check the flue pipe between your furnace or boiler and the chimney.

A faulty flue pipe attached to a water heater caused the carbon monoxide leak that killed a restaurant manager and sickened 27 others on Saturday on Long Island, a fire official said.

If the flue pipe be carried up a considerable distance inside the apartment to be warmed before being turned into the external air, practically the whole of the heat generated will be utilized.