Environmental Monitoring Petri plate height

Few days later I have a interview and the interviewer asked me a question that from how much height should we take the particle count from the HEPA filter? Kindly guide me with reference.

nmt 1 meter height
Laminarity will maintain at this height

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generally it should be taken from the working height i.e place where you work. But some references says it should be 1m or 2 feet above the surface i.e workbench.

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From classified room can we exposed the plate over the riser hight

Height is about 1.5 feet and at a angle of 45 deg.

first put in stanles steel table and the height nmt 1mm

ISO 14644 GUIDELINES refer