UL - 1777 CRD
UL Standard for Safety Chimney Liners - Subject: REQUIREMENTS FOR METALLIC CHIMNEY LINERS FOR FACTORY-BUILT CHIMNEYS OR GAS VENTS
|Publication Date:||15 April 2013|
These requirements cover metallic and nonmetallic chimney liners intended for field-installation into new or existing masonry chimneys and metallic chimney liners intended for field-installation into factory-built chimneys or gas vents.
These liners are intended to be used in conjunction with and for the natural draft venting of Category I gas-fired, Type L vented oil-fired, and solid-fuel-fired residential-type appliances in which the maximum continuous flue-gas outlet temperatures do not exceed 1000°F (538°C).
Chimney liners for field installation into masonry chimneys are intended to be installed in existing masonry chimneys with or without a liner of fire-clay tile, or to be used as a substitute for masonry fire-clay tile flue liners in new chimneys.
FACTORY-BUILT CHIMNEY - A factory built, vertical (or approximately vertical) metallic shaft enclosing at least one flue for conducting flue gases to the outdoor atmosphere.
WALL PENETRATION ASSEMBLY - A device used to provide a means for routing a chimney connector through a combustible wall to a masonry or factory-built chimney.
Gas Vent - A flue gas passage for the venting of Category I gas-fired appliances.