According to ISO-14644, leakage tests must be carried out on the terminal HEPA filters. What is the situation if only EPA filters (H11) have been installed in cleanrooms (RRK D)? Is a classification measurement of the cleanroom sufficient in this case, as H11 filters cannot be tested in accordance with ISO 14644-3?
H11 filters cannot be tested according to the standard. Carry out a risk analysis and then decide whether a filter change to H13 is necessary or whether a room measurement (regular) is sufficient.
