What rule applies to exhaust?

The rule that applies to exhaust typically refers to the proper management and release of combustion gases from an engine or system. This includes ensuring that exhaust systems are designed to minimize emissions, reduce noise, and enhance engine performance. Compliance with environmental regulations, such as those set by the EPA or similar authorities, is crucial to limit pollutants released into the atmosphere. Additionally, proper maintenance of exhaust systems is necessary to ensure efficiency and safety.