Bird screen pressure drop. By using the following suggestions, designers will maximize louver performance and ensure that lou-vers are equipped to meet the needs of their specific application. Free area and the aerodynamic properties of the louver product are among items that play a part in determining pressure drop. 3" free area is required. Lower pressure drop is generally considered more advantageous. The numbers we calculated using the ASHRAE methods seemed As air flows through the screen a static pressure drop occurs across it. Screen: Galvanized steel bird screen 12 x 12 x 1mm fixed behind the blades. Please note that Pressure Drop Data is obtained from AMCA Test without bird screen. Adapted from HVAC Systems Duct Design, Third Edition, 1990, Sheet Metal & Air Conditioning Contractor’s National Association Sep 8, 2016 · We are proposing 10% of PVSV set pressure for back pressure data due to not having bird screen size info and pressure loss across this. Standard 1/2-inch mesh (approximately 75 per cent free area) adds about 5–8 per cent to a louver’s pressure drop. Jul 3, 2025 · This size is applicable for the specific location I am from with respect to local regulations; however, adding a bird screen is actually reducing the outlet area and increasing pressure drop. o9m dmy kixsx6 jbkm fpvh1p cw zvupwph qt98jp vxf vdoyp8