UL 103:2017 pdf download.Factory-Built Chimneys for Residential Type and Building Heating Appliances.
6.8 Galvanized steel used for outer casings, structural parts, firestopprng or other components or subassemblies shall have a zinc-coating complying with the coating designation G90 (former coating class 1.25 commercial) in the Weight (Mass) of Coating Requirements table of Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron ANoy-Coated (Galvarinealed) by the Hot-Dip Process, ASTM A653, with not less than 40 percent of the zinc on any side, based on the minimum single spot test in the ASTM designation. The weight of zinc coating shall be established in accordance with the Standard Test Method for We.ght [Mass] of Coating on Iron and Steel Articles with Zinc o Zinc-Alloy Coatings, ASTM A90. Aluminum-coated steel shall be of Type T1-40 (regular) [0.40 ounce per square foot (0.12 kg/rn2)].
6.9 Components of a chimney, or subassemblies, which are not required to conform to the requirements for flue-gas conduits or outer casings, shall be of materials and thicknesses as specified in Table 6.1, or the equivalent.
6.10 A painted part made of steel not less than 0.053 inch (1.35 mm) thick, or of cast iron not less than 0.125 Inch (3.18 mm) thick, and for use only in the interior of buildings, is determined as having corrosion resistance equivalent to that required by 6.8. Paint coatings shall remain intact at the maximum temperatures obtained on the part dunng the tests specified in these requirements.
6.11 Except for binder materials, thermal insulation material shall be noncombustible.
6.12 Thermal Insulation shall not come into contaci with the products of combust,on.
6.13 Thermal insulation that is not self-supporting shall be applied to solid surfaces so that the insulation does not sag. An adhesive or cement used to attach such material shall retain its adhesive qualities at any temperature Pie adhesive attains when tested in accordance with these requirements and at 0°F (minus 16°C).
6.14 A water-absorbing rnsulating material shall not be subject to wetting by condensation or rain when installed as intended.
6.15 Asbestos material shall not be used.
6.9 Components of a chimney, or subassemblies, which are not required to conform to the requirements for flue-gas conduits or outer casings, shall be of materials and thicknesses as specified in Table 6.1, or the equivalent.
6.10 A painted part made of steel not less than 0.053 inch (1.35 mm) thick, or of cast iron not less than 0.125 Inch (3.18 mm) thick, and for use only in the interior of buildings, is determined as having corrosion resistance equivalent to that required by 6.8. Paint coatings shall remain intact at the maximum temperatures obtained on the part dunng the tests specified in these requirements.
6.11 Except for binder materials, thermal insulation material shall be noncombustible.
6.12 Thermal Insulation shall not come into contaci with the products of combust,on.
6.13 Thermal insulation that is not self-supporting shall be applied to solid surfaces so that the insulation does not sag. An adhesive or cement used to attach such material shall retain its adhesive qualities at any temperature Pie adhesive attains when tested in accordance with these requirements and at 0°F (minus 16°C).
6.14 A water-absorbing rnsulating material shall not be subject to wetting by condensation or rain when installed as intended.
6.15 Asbestos material shall not be used.
