1.1 This specification establishes the criteria for acceptance, prior to installation, of clay flue liners and chimney pots used for conveying hot gases in masonry chimneys. 1.2 The values stated in inch-pound units are This specification establishes the criteria for acceptance, prior to installation, of clay flue liners and chimney pots used for conveying hot gases in masonry chimneys. The liners and pots shall be manufactured from fire clay, shale, surface clay, or