[COLOR="#0000CD"]Our facility has been designed to achieve minimum differential pressure across clean rooms. The lower limits of differential pressure between different rooms have been set at 10Pa, 20Pa or 40Pa.
However, we have been requested to also define upper specification limits for the differential pressure across the rooms. Their concern was that the higher the differential pressure, the more turbulent the air flow in the room is. Turbulence is required in Class B, C & D areas, however up to a certain extent in order to avoid contamination from the floor etc.
Is there any rule or guidance to be followed in order to define the upper specification limits? Which would be the rational for defining these limits? [/color]