Allowable Air Intake Restriction
Allowable Exhaust Back Pressure
In-Use Testing Requirements
Exhaust systems should be designed so that a 20 cm (7.87 in.) extension can be installed to the end of the
exhaust pipe for purposes of sampling emissions. For equipment that does not allow installation of an extension
pipe, a connection must be designed into the exhaust system for temporary attachment of exhaust sampling
equipment. An example of an approved connection would be internally threaded with standard pipe threads of a
size not larger than one-half inch, and shall be closed by a pipe-plug when not in use.
Engine model
Allowable air intake restriction ≤ kPa (mmAq)
Initial upper limit Upper limit for air cleaner replacement
All TNV models
2.94 (300)
6.23 (635)
Engine model
Allowable air intake restriction ≤ kPa (mmAq)
Initial upper limit Upper limit for exhaust system cleaning
All models
12.7 (1300)
45 (4590)
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