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The Goodman 4053501S is a genuine OEM chimney (flue) collar for GDT090-4A gas furnaces. This factory-formed collar creates the sealed connection between the furnace's induced-draft outlet and the vent pipe, ensuring combustion byproducts are drawn out correctly and safely. A corroded, warped, or missing collar can cause vent leaks, poor draft, and rollout conditions — making a proper replacement important for safe operation.
The OEM 4053501S is stamped to the exact diameter and flange pattern of the GDT090-4A vent outlet, so it seats flush and seals without modification. Universal collars often require cutting, bending, or extra sealant and may not maintain a proper draft. Because this part is part of the combustion-venting path, the exact-fit OEM collar is the correct choice.
Easy to Moderate — mounts with sheet-metal screws and high-temp sealant, about 20–30 minutes depending on access. Shut off the furnace first. After installation, verify proper draft and check for flue-gas leaks with the burners running.