Will this fit a Goodman gmnt80-4 gas furnace

Yes, the Goodman 2820005S 17.5-inch flue collector box kit is compatible with the Goodman GMNT080-4 gas furnace. It is specifically designed for 80,000 BTU, 17.5-inch cabinet models across the GMT, GMN, GMP, and GMNT series. When replacing this part, ensure that you thoroughly clean off the old gasket material and install a fresh high-temperature seal to prevent dangerous flue gas leaks. It is also good practice to inspect the draft inducer assembly and pressure switch tubing for any signs of corrosion or cracking while you have the unit open.

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