A-B1691897-AI DUCT-AIROne New Aftermarket Replacement Air Duct Fits Briggs and Stratton Small Engines This aftermarket replacement air duct (Duct Air) routes air from the flywheel cover to the engine air cleaner, maintaining optimal airflow to keep Fits Briggs and Stratton (B&S) small engines running cooler and more efficiently. A worn or cracked air duct can disrupt the engine cooling system and lead to overheating replacing it promptly helps protect the engine from