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• • <br /> System Design <br /> 3-6.1.1 DUCTS <br /> The ADP nozzle,P/N B120011,is used for protection of the exhaust ductwork. <br /> The duct cross section can be any shape, not including obstructions (i.e., round, square, or <br /> rectangular)and the duct itself can be of unlimited length.In accordance with NFPA 96,the exhaust <br /> fan should be left running at the time of system discharge.This will help to remove smoke and other <br /> airborne materials and gases from the hazard area in the event of a fire. Check with the Authority <br /> Having Jurisdiction for local requirements. A damper, if present, should be left open at system <br /> discharge.However,if the damper is closed,the system designer must insure that additional nozzles <br /> are required. <br /> 3-6.1.1.1 Protection of Ducts 0 to 50 inches in Perimeter <br /> One ADP nozzle,P/N B120011,is required for protection of a duct with a perimeter up to 50-inches <br /> (refer to Figure 3-29).Length of duct is unlimited. <br /> The nozzle is located at the geometric center of the cross-sectional area that it is protecting,and is <br /> located in the duct within six inches of the entrance. <br /> Note: All Range Guard systems are listed by UL and ULC for use with the exhaust fan either on or <br /> off when the system is discharged. <br /> DUCT <br /> HOOD <br /> DUCT PERIMETER UP TO AND INCLUDING 50 in.(1270 mm) <br /> 11.78 in.(300 mm) 15.91 in. <br /> MAX.DIAGONAL (404 mm) <br /> ♦MAX..* If—"B„—H <br /> 12.5 in. 11.78 in.(300 mm) <br /> (318 mm) _Kr— f MAX.DIAGONAL <br /> MAX. <br /> SQUARE DUCT RECTANGULAR DUCT <br /> 2"A"+2'B"=65 in.(1651 mm) <br /> ROUND DUCT <br /> OF VERTICAL DUCT <br /> Q <br /> ADP NOZZLE1/ VERTICAL/HORIZONTAL DUCT � AIM POINT <br /> 1 0-6 in.(0-152 mm) <br /> A ADP NOZZLE i <br /> DUCT ENTRANCE ? '; Q OF HORIZONTAL DUCT <br /> 2 to 4 In.(51 to 102 mm) <br /> NOZZLE TIP to DUCT HIP <br /> Figure 3-29. Duct Protection Using Single ADP Nozzle,P/N B120011 <br /> P/N 9127100 3-35 January 2007 <br /> 23 )24 <br />