Midwest Hearth replacement combustors are a high-quality choice for your catalytic wood burning stove. Includes interam expanding gasket wrap (2″wide x 18″ long) that can be used if needed. DECREASES POLLUTION – Midwest Hearth combustors remove 70% of harmful wood stove emissions, keeping the air clean and your family healthy. IMPROVED SAFETY – Catalytic combustors prevent the buildup of creosote, so there’s a lower risk of house fires. Since 1990, the number of creosote-caused fires has decreased by 75% thanks to catalytic stoves.