THX for the reply. Also found this on different sites.
Currently I'm contacting AMCA about this. Because I don't have a clue how you should measure or determine the flow settling means.
Hello,
Currently I'm designing a new measuring station to determine the air flow rate of an aircurtain.
In the standard 210 of AMCA Labroratory Methods of Testing Fans for Aerodynamic Performance Rating there are 3 different test methods that can work. These are Figure 11 Outlet Chamber...