[Code of Federal Regulations]
[Title 40, Volume 30]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1065.20]

[Page 653]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1065_TEST PROCEDURES AND EQUIPMENT--Table of Contents
 
             Subpart A_Applicability and General Provisions
 
Sec. 1065.20  Limits for test conditions.

    (a) Unless specified elsewhere in this chapter, you may conduct 
tests to determine compliance with duty-cycle emission standards at 
ambient temperatures of 20-30[deg] C (68-86[deg] F), ambient pressures 
of 600-775 mm Hg, and any ambient humidity level.
    (b) Follow the standard-setting part for ambient conditions when 
testing to determine compliance with not-to-exceed or other off-cycle 
emission standards.
    (c) For engine testing in a laboratory, you may heat, cool, and/or 
dehumidify the dilution air before it enters the CVS.
    (d) For engine testing in a laboratory, if the barometric pressure 
observed while generating the maximum-torque curve changes by more than 
25 mm Hg from the value measured when you started mapping, you must 
remap the engine. Also, to have a valid test, the average barometric 
pressure observed during the exhaust emission test must be within 25 mm 
Hg of the average observed during the maximum torque curve generation 
(see Sec. 1065.510).