part_subject: "CONTROL OF EMISSIONS FROM NONROAD SPARK-IGNITION ENGINES AT OR BELOW 19 KILOWATTS"
subpart_code: "E"
subpart_subject: "Gaseous Exhaust Test Procedures"
section_number: "90.407"
section_subject: "Engine inlet and exhaust systems."
cfr_reference: "40 CFR 90.407"
title_name: "Title 40"
title_subject: "Protection of Environment"
parts_covered: "Parts 87 to 95"
revised_date: "Revised as of July 1, 2017"
publication_date: "As of July 1, 2017"
contains_description: "Containing a codification of documents of general applicability and future effect"
publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"
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(a)The engine manufacturer is liable for exhaust emission compliance over the full range of air inlet filter systems and exhaust muffler systems.
(b)The air inlet filter system and exhaust muffler system combination used on the test engine must be the systems expected to yield the highest emission levels.