CAN/ULC-S640-M91

1.1 These requirements cover lining systems for new masonry chimneys. 1.2 Liners are for use with gas, liquid and solid fuel-fired residential appliances and building heating equipment, where the flue-gas temperatures normally do not exceed 650 degrees C. They are intended for use in accordance with the National Building Code of Canada, the Installation Code for Oil Burning Equipment, CAN/CSA-B139, Gas Burning Equipment, CAN/CGA-B149.1 and CAN/CGA-B149.2, Installation Code for Solid-Fuel-Burning Appliances and Equipment, CAN/CSA-B365, and CAN/CSA-A405, Design and Construction of Masonry Chimneys and Fireplaces. 1.3 Liners are intended for field installation in masonry or concrete chimneys located inside or outside of buildings to provide an essentially vertical conduit or passageway for conveying flue gases to the outer air from the above-described class of appliances. 1.4 Liners as covered by the Standard are intended for installation in accordance with the manufacturer's Installation Instructions. 1.5 Liners, as covered by this Standard, are not intended for use with high efficiency appliances that require type BH gas venting systems, or that create positive pressures in the chimney.