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The ROYAL BUILDING PRODUCTS 35-90 is an 8-inch single-wall galvanized vent pipe elbow designed for 22.5-degree directional changes in venting runs. This fitting is used to offset vent connectors within a flue system, routing exhaust gases from gas-fired appliances to the terminal or chimney connection. The elbow is constructed for use in standard single-wall vent connector applications and is installed by HVAC technicians and mechanical contractors during new construction and retrofit projects. At 8 inches in diameter, it fits into common residential and light-commercial vent connector sizes.
This elbow is suited for use in single-wall vent connector systems serving gas-fired furnaces, boilers, water heaters, and similar appliances that require B-vent or single-wall connector routing. The 22.5-degree angle allows for gradual directional transitions in tight mechanical spaces where a full 45- or 90-degree elbow would not fit. It is typically installed in horizontal or slightly pitched vent connector runs leading to a vertical flue or chimney.
Designed as an OEM-style replacement or new-installation fitting for 8-inch single-wall galvanized vent connector systems on gas-fired appliances.
Installation should be performed by a licensed HVAC technician or mechanical contractor in accordance with NFPA 54 and local mechanical codes. Shut off and isolate the appliance before disconnecting or modifying any vent connector sections. Single-wall vent connectors must maintain required clearances to combustibles as specified by the appliance manufacturer and applicable codes. Do not use single-wall vent pipe in concealed spaces or as a replacement for listed double-wall B-vent pipe where codes require it.
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