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Chain saws - long-life air filtration system
The STIHL MS 261, MS 271, MS 291 and MS 441 professional saws also have a new type of long-life air filtration system with pre-separation that perceptibly relieves the downstream filter components.
Air drawn in is swirled. The larger, heavier particles are thrown to the outside. The pre-cleaned air is routed to the air filter via the pre-separator duct.
The big fabric filter: Ideal in normal operating conditions and for winter duty.
The big HD filter: Specifically for dry and very dusty conditions.
STIHL long-life air filtration systems with pre-separation achieve perceptibly longer filter life compared with conventional filter systems.