This appendix gives directions for measuring nominal air
                           change and air distribution in connection with testing of ventilation
                           plants in ro-ro ships cargo spaces where running of vehicles with
                           internal combustion engines occurs.
                        
                        
                        
                        
                        The nominal air change is measured by calculation of the air
                           flow in supply air and exhaust air terminal devices. The air distribution
                           is normally estimated visually with visible smoke, or by measuring
                           with tracer gas.