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

SECTION IV — SYSTEM DESIGN UL EX. 3470 7.1.96 Page 4-88 REV. 2 NOZZLE PLACEJENT REQUIREMENTS (Continued) Plenum Protection (Continued) 4 IN. (10 MI NOZZLE TIP MUST aE WnNIN 7 HIS AREA 1N NOZZLE — PART NO. 419335 Exception: When the plenurn chamber contains tillers that to not exceed 10 in. (25.4 cm) in height and the 1 N nozzle can be 121N. (30 =1 installed at the intersecting center lines of both filter banks and MAXIMUM not exceed the 2.4 in. (5 to 10 cm) distance from either fillers, ya single 1N nozzle can be used. See Figure 27a. e IN. (20 a) MINIMUM 11 2-41N. 2-4 IN. 2-4ant IfID and FIGURE 26 One IN nozzle will protect 8 linear feet (2.4 m) of single filter bank plenum or two 1 N nozzles wi!I protect 3 linear feet (2.4 cm) of "V" bank plenum. In either application, the nozzle(s) must be mounted in the plenum, 2 to 4 in. (5 to 10 cm) from the face of the filter, centered between the filter height dimension, and aimed down the length. The filter height must not exceed 20 in. (51 cm). See Figure 27. a 2-4 IN, a Fr. Iz.t 1 X (6-10 MI MAXIMUM 2.4 20 IN. (51 and (5- 0 (6- 10 emI a FT. (2.4 m) 5- e 9 MAXIMUM 10 M 201N.(61 an( MAXIMUM 10 IN. (26A eml MAXIMUM FIGURE 27a NOTICE If 1 N nozzle coverage does not exceed 7linear ft. (2.1 m), the nozzle can be mounted 2 to 6 in. (5.15 cm) from the face of the filter. For a plenum, either single or "V" bank, with a linear extension longer than 8 feet (2.4 m), each bank may be protected using one 1 N nozzle every 8 ft. (2.4 m) or less depending on the overall length of the plenum. See Figure 28. The nozzles may point in the opposite directions as long as the entire plenum area is pro- tected, and the 8 ft. (2.4 m) limitation is not exceeded. See Figure 29. The nozzle positioning shown in Figure 30 is not an accept- able method of protection bevause the plenum area directly under the tee is not within the discharge pattern of either nozzle. FIGURE 26 31 FIGURE 27