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P/N 15040 System Design Page 3A-38 <br /> 3A.4.3 Duct Coverage, VPSB <br /> The D/P Nozzle will protect either round or rectangular ducts up to 28 feet in length. Any change in duct direction or <br /> additional length requires an additional D/P nozzle. The duct nozzle must be centered at the duct entrance, pointed in <br /> the direction of air flow. The tip of the duct nozzle must be within 6"of the duct entrance. <br /> Round Ducts <br /> Maximum Diameter,Single Nozzle=46 Inches Rectangular Ducts <br /> _Maximum Diameter,Two Nozzles=52 Inches The following table shows sample maximum rectangular <br /> (nozzle spacing: .5 x duct diameter, located on the dimensions, based on the following two requirements: <br /> same plane) Maximum Perimeter=144.5 Inches <br /> Maximum Diagonal=46 Inches <br /> Spacing for two nozzles, protecting a duct <br /> diameter larger than 46", up to 52"maximum Rectangular Ducts <br /> Side 1, Inches Side 2, Inches, <br /> Maximum <br /> 12 44.4 <br /> 14 43.8 <br /> 16 43.1 <br /> 18 42.3 <br /> .5 x DUCT <br /> DIAMETER 20 41.4 <br /> 22 40.4 <br /> 24 39.2 <br /> 26 37.9 <br /> 28 36.5 <br /> 30 34.8 <br /> 32 33.0 <br /> 32.5 32.5 <br /> 34 31.0 <br /> 36 28.6 <br /> 38 25.9 <br /> 40 22.7 <br /> 42 18.7 <br /> 44 13.4 <br /> UL EX 5208 April 9,2013 <br />