Laserfiche WebLink
<br />, 'i <br /> <br />SECTION IV - SYSTEM DESIGN <br />UL EX. 3470 11:1-94 Page 4-2 <br /> <br />NOZZLE PLACEMENT REQUIREMENTS (Continued) <br /> <br />Duct Protection (Continued) <br /> <br />The 1W and 2W nozzles will protect the following: <br /> <br />3. Single Nozzle (2W) Duct Protection: <br /> <br />One 2W nozzle will protect ducts with a maximum perim- <br />eter of 75 in. (190.5 em) or a maximum diameter of 24 in. <br />(61 em). The nozzle must be installed 2-8 in. (5-20 em) into <br />the center of the duct opening and positioned as shown in <br />Figure 4. <br /> <br />i <br /> <br /> <br />2-8 IN. <br />(5-20 emJ( <br /> <br />FIGURE 4 <br /> <br />4. Single Nozzle (2W) Transition Protection: <br /> <br />One 2W nozzle will protect transitions at the point where <br />the perimeter of 75. in. (190.5 em) or the diameter of 24 in. <br />(61 em) or less begins within that transition. The nozzle must <br />be placed in the center of the transition opening where the <br />maximum perimeter or diameter begins as shown in Figures <br />5 and 6. <br /> <br /> <br />MODULE PERIMETER <br />NOT MORE THAN <br />15. IN. (190.5 em) <br /> <br />FIGURE 5 <br /> <br /> <br /> <br />MODULE DIAMETER <br />NOT MORE THAN <br />24 IN. (61 em) <br /> <br />FIGURE 6 <br /> <br />5. Dual-Nozzle Duct Protection: <br /> <br />Two 2W nozzles will protect ducts with a maximum perim- <br />eter of 150 in. (381 em) or a maximum diameter of 48 in. <br />(122 em). The nozzles must be installed 2-8 in. (5-20 em) <br />into the duct opening and positioned as in Figure 7. <br /> <br /> <br />FIGURE 7 <br /> <br />NOTICE <br /> <br />In installations where a UL listed damper <br />assembly is employed, the duct nozzle can be <br />installed beyond the 8 in. (20 em) maximum, <br />to a point just beyond the damper assembly <br />that will not interfere with the damper. <br />Exceeding the maximum of 8 in. (20 em) in <br />this way will not void the UL listing of the <br />system. <br /> <br />, ..~ <br />