Air Sampler Validation

I have a query regarding air sampler used for sampling of air in clean room.
Do we need to perform validation of it and if yes then what are the criteria against which we should validate the instrument?
Any guideline available for the same if shared will give more clarity.

Dear Deepa

Pls reffer ISO 14698- 1 & 2 for Air Sampller Qualification.

Himanshu C