
Fire clay or terracotta pipe, round or square, usually made in all ordinary flue sizes and in 2-foot lengths, used for the inner lining of chimneys with the brick or masonry work around the outside. Flue lining in chimneys runs from about a foot below the flue connection to the top of the chimney.
Found on
http://www.encyclo.co.uk/local/20933

- 2-foot lengths, fire clay or terra-cotta pipe (round or square) and usually madein all ordinary flue sizes. Used for the inner lining of chimneys with the brick or masonry work done around the outside. Flue linings in chimneys runs from one foot below the flue connection to the top of the chimney.
Found on
http://www.homebuildingmanual.com/Glossary.htm

The lining within a chimney to protect the brickwork from the effects of the waste fumes. Essential for high output gas appliances such as boilers. Often a metal tube (usually stainless steel and can be retro fitted) but can be made from special bricks and built into the flue.
Found on
https://www.diydata.com/general_building/building_glossary.php

2-foot lengths, fire clay or terra-cotta pipe (round or square) and usually madein all ordinary flue
Found on
https://www.encyclo.co.uk/local/22400

2-foot lengths, fire clay or terra-cotta pipe (round or square) and usually madein all ordinary flue sizes. Used for the inner lining of chimneys with the brick or masonry work done around the outside. Flue linings in chimneys runs from one foot below the flue connection to the top of the chimney.
Found on
https://www.homebuildingmanual.com/Glossary.htm
No exact match found.