9803 19TH AVE SE 2018-01-02 MF Import

SECTION IV — SYSTEM DESIGN I UL EX. 3470 11.1-94 Page 4-2 NOZZLE PLACEMENT REQUIREMENTS (Continued) Duct Protection (Continued) The 1 W and 2W no;sles will protect the following: 3. Single Nozzle (2W) Duct Protection: One 2W nozzle will protect duds with a maximum perim- eter of 75 in. (190.5 cm) or a maximum diameter of 24 in. (61 cm). The nozzle must be installed 2-8 in. (5.20 cm) into the center of the dud opening and positioned as shown in Figure 4. FIGURE 6 S. Dual -Nozzle Duct Protection: Two 2W nozzles will protect duds with a maximum perim- eter of 150 in. (381 cm) or a maximum diameter of 48 in. (122 cm). The nozzles must be installed 24 in. (5.20 cm) into the dud opening and poeidoned as in Figure 7. FIGURE 4 4. Single Nozzle (2W) Transition Protection: One 2W nozzle will protect transitions at the point where the perimeter of 75. in. (190.5 cm) or the diameter of 24 in. (61 cm) or leas begins withir, that transition. The nozzle must be placed in the center of the transition opening where the maximum perimeter or diameter begins as shown in Figures 5 and 6. N MODULE PERIMETER rqr MORE TRu+srtwa FIGURE 7 75. IN. (1901 CMcm) NOTICE ' In installations where a UL listed damper assembly is employed, the dud nozzle can be installed beyond the 8 in. (20 cm) maximum, to a point just beyond the damper assembly that will not Interfere with the damper. Exceeding the maximum of 8 in. (20 cm) in this way will not void the UL listing of the system. FIGURE 5