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The Power That Works For You.
Look For Relevant Emissions Durability Period and
Air Index Information On Your Engine Emissions Label
Engines that are certified to meet the California Air Resources Board (CARB) Tier 2 Emission Standards must display information regard-
ing the Emissions Durability Period and the Air Index. Briggs & Stratton makes this information available to the consumer on our emission
labels and hang tags.
The Emissions Durability Period describes the number of hours of actual running time for which the engine is certified to be emissions
compliant, assuming proper maintenance in accordance with the Operating & Maintenance Instructions. The following categories are
used:
Moderate: Engine is certified to be emission compliant for 50 hours of actual engine running time.
Intermediate: Engine is certified to be emission compliant for 125 hours of actual engine running time.
Extended: Engine is certified to be emission compliant for 300 hours of actual engine running time.
For example, a typical consumer string trimmer is used 5 to 10 hours per year. Therefore, the Emissions Durability Period of an engine
with an moderate rating would equate to 5 to 6 years.
The Air Index is a calculated number describing the relative level of emissions for a specific engine family. The lower the Air Index, the
cleaner the engine. This information is displayed in graphical form on the emissions label or hang tag.
After July 1, 2000, Look For Emissions Compliance Period On
Engine Emissions Compliance Label
After July 1, 2000 certain Briggs & Stratton engines will be certified to meet the United States Environmental Protection Agency (USEPA)
Phase 2 Class IV emission standards. For Phase 2 Class IV certified engines, the Emissions Compliance Period referred to on the Emis-
sions Compliance label indicates the number of operating hours for which the engine has been shown to meet Federal emission require-
ments. For engines equal to or greater than 20 cc, and less than 50 cc displacement, Category C = 50 hours, B = 125 hours and A =
300 hours.
The displacement of Model Series 21000 engines is 34 cc, 21100 engines is 40 cc.
This is a generic representation
of the emission label typically
found on a certified engine.
