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The AMERICAN METAL PRODUCTS 40T is an oval standard tee fitting designed for Type B gas vent systems. It provides a branch connection in a venting run, allowing a secondary appliance or lateral vent section to tie into the main vertical vent stack. The 40T measures 4 inches in diameter and 12 inches in length. This fitting is domestically produced and is installed by licensed HVAC technicians and gas appliance service professionals during vent system assembly, repair, or upgrade work.
The 40T oval tee is used in residential and light commercial Type B double-wall gas vent installations. It is suited for natural gas and propane appliance venting where a branch or tee configuration is required in the vent run. Its oval profile allows the fitting to pass through standard framing cutouts, simplifying installation in new construction and retrofit applications where clearance is limited.
Designed as an OEM-style replacement or new-installation component for Type B double-wall gas vent systems requiring a 4-inch diameter oval tee fitting.
Installation should be performed by a licensed HVAC technician or gas service professional in accordance with the International Fuel Gas Code (IFGC) and the appliance manufacturer's venting instructions. Shut off the gas supply and allow connected appliances to cool completely before servicing any vent section. Ensure all vent joints are properly secured per the vent system manufacturer's assembly requirements. Maintain required clearances to combustibles as specified by applicable local codes.
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