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Today's Hours 8am - 11pm estThe Sterling 5-Inch Horizontal Combustion Air Inlet Kit is designed for compatible XF Series 100-250 unit heaters. This kit provides a practical solution for bringing in outside combustion air through a horizontal inlet connection, helping support proper airflow and reliable heater operation. Designed specifically for compatible Sterling XF Series installations, it helps simplify combustion air setup while maintaining dependable system performance.