Is it correct to specify a minimum number of “Air Changes per Hour” for a given cleanliness class ?
Air changes per hour is a DEPENDENT, and NOT an independent variable. AC/Hr. is simply the calculation of the HEPA filtered air entering the room in one hour divided by the effective room volume. Though thumb rules are available for consideration while designing Cleanrooms, experience of designing number of Cleanrooms tells us, what AC/Hr. to consider for achieving the desired Cleanliness level in a room.
