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The B4022700 is a genuine OEM 3-inch in-shot burner for the Amana AMH80805CNBA gas furnace. Each in-shot burner directs a metered gas/air mixture into one heat-exchanger tube; furnaces use one per tube. Over time burners can rust, clog with debris, or develop an uneven, lazy, or yellow flame that causes rollout, sooting, or flame-sensing problems. Replacing a corroded burner restores clean, blue, evenly distributed combustion.
In-shot burners are matched to the furnace's orifice size, port pattern, and heat-exchanger geometry. The OEM burner reproduces the exact flame profile the unit was certified with; a mismatched generic burner can cause improper combustion, sooting, or flame-rollout safety trips.
Power off and shut the gas. Remove the burner-assembly bracket, slide the burner off its orifice, and align the new burner squarely over the orifice and into the heat-exchanger inlet. Verify flame quality after restart. Recommended for experienced DIYers or a technician. Typical time: 30–45 minutes.