Flow resistance of ventilation products
Extensive testing in collaboration with the University of Birmingham and Silsoe Research Institute using large and small-scale facilities for measuring air-flow resistance has led to the production of a comprehensive report detailing the discharge coefficients for all Passivent ventilation products. The report gives details of test procedures, theory and test data:
"Discharge coefficients and Equivalent areas for Passivent natural-ventilation products: measurements and theory" by A.P. Robertson, 4th Ed, Sept 2008.