Uni-Stack-1800 refractory-lined, steel ductwork is designed to withstand high temperatures and resist corrosion from acid gases in chimney, breeching, and exhaust systems that vent boilers, furnaces, incinerators, fireplaces, appliances that burn wood or coal, kilns, kitchen appliances, diesel/gas engines, heat recovery systems, and process equipment. It can be used with all types of fuels and combustible materials. Uni-Stack-1800 ductwork can handle flue gas with a maximum temperature range of 960°F to 3,100°F for continuous firing and intermittent firing.
Uni-Stack-1800 duct is constructed with a welded (or riveted for 26 gauge) longitudinal seam in standard lengths of 36 inches for inside diameters of 4 through 8 inches, and lengths of 48 inches (72 inches for heavy gauges) for inside diameters of 9 through 60 inches. Standard diameters are 4 to 60 inches inside diameter (Model 1800 Plus is 4 to 60 inches and Model 1800 BB is 30 inches or greater). Standard outer shell materials are 26-gauge aluminized steel or 11-gauge galvanized steel. Stainless steel (304 and 316) jackets are available. Model 1800 is not available in 26 gauge for inside diameters greater than 36 inches. Components are joined with a leak-proof and acid-resistant sealant. An 8-inch-wide, 26-gauge aluminized steel draw band is placed over each sealed joint and bolted tightly to secure the joint. For heavy-gauge outer shells, an 11-gauge galvanized steel draw band is available. Joints can also be welded to increase strength.
For noncombustible materials, a clearance of 2 inches is required for inside diameters of 4 to 18 inches, and a clearance of 4 inches is required for inside diameters greater than 18 inches. Note: clearances in a noncombustible interior chase shall be as necessary to ease installation and/or allow access.
The following clearances must be maintained between Model 1800 and combustible building materials (a clearance of 6 inches is required for all diameters when used with low-heat appliances producing flue gas temperatures of 1,000°F or less).
Application References and Listings: UL (Model 1800 only), BOCA, NFPA, SBC, UBC, NBC, ICBO
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