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System Design 3-6.1.1 DUCTS The ADP nozzle, P/N 87-120011-001, is used lbr protection of the exhaust ductwork. The duct cross section can be any shape, not including obstructions (i.e., round, square, or rectangular) and the duct itself can be of unlimited length. In accordance with NFPA 96, the exhaust fan should be left running at the time of system discharge. This will help to remove smoke and other airborne materials and gases from the hazard area in the event of a fire. Check with the Authority Having Jurisdiction for local requirements, A damper, if present, should be left open at system • discharge, However, if the damper is closed, the system designer must insure that additional nozzles are required. 3-6.1.1.1 Protection of Ducts 0 to 50 inches in Perimeter One ADP nozzle, P/N 87-120011-001, is required for protection of a duct with a perimeter up to 50 inches (refer to Figure 3-29). Length of duct is unlimited. The nozzle is located at the geometric center of the cross-sectional area that it is protecting, and is located in the duct within six inches of the entrance. Note: All Range Guard systems are listed by UL and ULC for use with the exhaust fan either on or off when the system is discharged. DUCT HOOD • DUCT PERIMETER UP TO AND INCLUDING 50 in.(1270 mm) 11.78 in.(300 mm) 15.91 in. MAX. DIAGONAL (404 nun) l+-MAX. t lit E3: 12.5 in. ( _ ,. _... 11..78 in,(300 mm) (318 mm) -- MAX.DIAGONAL MAX. SQUARE DUCT 1 ! RECTANGULAR DUCT 2"A"+2"8" =65 in.(1651 mm) ROUND DUCT It OF VERTICAL DUCT ADP NOZZLE VERTICAL/HORIZONTAL DUCT T , AIM POINT 0 .6 in.(0-152mm) ADP NOZZLE i >t DUCT ENTRANCE ' Q OF HORIZONTAL DUCT 2 to 4 in.(51 to 102 mm) NOZZLE TIP to DUCT HIP Figure 3-29. Duct Protection Using Single ADP Nozzle, P/N 8'7-1 200 1 1-00 1 P/N 60-9I 27I 00-000 3-35 April 2009