1.1 This test method can be used to estimate the particulate matter concentration in stationary source stacks.

1.2 With the nozzle sizes specified herein, the method can be used for stack stream velocities from approximately 4 to 45 m/s (800 to 8000 ft/min).

1.3 Particulate matter present in a gaseous phase at the filtration temperature will not be collected. If significant quantities of condensible particulate matter are expected, this test method may not be the method of choice. If the temperature of the sampled gas at the filter is below the stream dewpoint this test method will not work. If moisture is expected to condense between the filter and the orifice, this test method is not applicable unless a moisture collection device is placed immediately upstream of the orifice and the sampling rate is adjusted for the volume of gas that condensed upstream of the orifice.

1.4 The values stated in SI units are to be regarded as the standard.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.