Dynamic pass box need to be installed between two different classified area/rooms for material pass through. The purpose is to provide barrier between areas & to sweep away the particulate load if present on surface of object being transferred to more clean area.
I) Is there any specific requirement of air velocity for pass box?
II) Whether blower is expected to remain ‘ON’ always irrespective of material transfer?
III) Is there any requirement about air flow movement either from pass box to area or vice a versa while door is open? (In case there is no fresh air port)
I would like to have your opinion with guideline reference if possible.