Air distribution and air diffusion — Aerodynamic testing and rating of constant and variable dual or single duct boxes and single duct units — Addendum 1: Variable primary flow rate control devices with induced flow facility
ISO 5220:1981/Add 1:1984Air distribution and air diffusion — Aerodynamic testing and rating of constant and variable dual or single duct boxes and single duct unitsAddendum 1: Variable primary flow rate control devices with induced flow facility