Process Guidance Note 6/34(11) - Defra

4.11 Exhaust flow rates should be consistent with efficient capture of emissions, good
operating practice and meeting the requirements of the legislation relating to the
workplace environment.
‣ The introduction of dilution air to achieve emission concentration limits should
not be permitted.
Representative sampling
4.12 Whether sampling on a continuous or non-continuous basis, care is needed in the
design and location of sampling systems, in order to obtain representative samples
for all release points.
‣ Sampling points on new plant should be designed to comply with the British or
equivalent standards (see paragraph 4.2).
‣ The operator should ensure that relevant stacks or ducts are fitted with
facilities for sampling which allow compliance with the sampling standards.
PG6/34(11) 18