page_title: Chainsaw safety features
section_title: Exhaust
hierarchical_section_title: Chainsaw safety features / Exhaust
caption_attribution_description: English: United States Forest Service "Spark Arresters Required" sign
context_page_description: Chainsaws incorporate numerous safety features common to many engine-driven power tools. Manufacturers have invented numerous design features to improve safety. Some features have become de facto standards, and others are legal requirements in particular jurisdictions. Best practice dictates that an operator should inspect the saw before starting work and only operate the saw if all the safety features are properly functional.
  Additional safety features are a significant commercial advantage to chainsaw producers. Companies continue to develop new features over time. Most chainsaw safety features are focused on the kickback problem, and seek to either avoid it, or to reduce the risk of injury should it occur.
  In addition to the safety features built into the chainsaw, operators should also wear specific chainsaw safety clothing. Most older saws have few or none of these features, and extra care should be taken in their use.
context_section_description: The exhaust directs the hot and noxious gases coming from the engine away from the user. A faulty exhaust increases noise, decreases engine power, can expose the user to unsafe levels of exhaust gases, and can increase the chance that the user could accidentally touch extremely hot metal. Most models feature a spark screen which is integrated into the muffler.  The spark screen prevents sparks from being discharged from the exhaust and potentially igniting sawdust.  The spark screen also reduces noise.
caption: Warning sign for mandatory use of spark arresters
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