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Division 3.3.3.3 For PM and PN emissions sampling, a dilution tunnel shall be used that:

Original text. Later amendments are not shown.

  1. (a)

    Consists of a straight tube of electrically-conductive material that is grounded;

  2. (b)

    Causes turbulent flow (Reynolds number ≥ 4 000) and be of sufficient length to cause complete mixing of the exhaust and dilution air;

  3. (c)

    Is at least 200 mm in diameter;

  4. (d)

    May be insulated and/or heated.