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Duct Plenum Appliance Branch Line Branch Line Branch Line 3/8 in. 3/8 in. 3/8 in. 8 ft. 4 ft. 12 ft. (2.4 m) (1.2 m) (3.7 m) 4 ft. 2 ft. 2 ft. (1.2 m) (.6 m) (.6 m) 4 4 6 2 2 4 4 2 4 DISTRIBUTION PIPING REQUIREMENTS (Continued) Distribution Piping Requirements - 6.0 Gallon Manifolded System . As an option to piping two (2) 3.0 gallon tanks separately, two (2) 3.0 gallon tanks can be manifolded together to share a common agent distribution line. Only (2) 3.0 gallon tanks connected to the same regulator can be manifolded. The following requirements ~ must be met when manifolding: 1. All piping must be 3/8 in. Schedule 40. . 2. See Figure 86 for tank connections. 3. The leng1h of supply line piping between the start of the first branch line and the start of the last branch line must not . exceed 24 ft. (7.3 m). See Figure 85. When the supply line is split, the combined total of both legs of the supply line (from the start of the first branch line to the start of the last branch line) must not exceed 24 ft. (7.3 m). 4. The combined length of all branch lines must not exceed 36 ft. ~ (10.9 m). See Figure 85. 5. A maximum of 22 flow numbers are allowed. 6. The requirements of the following table must not be exceeded. Requirements Pipe Size Maximum Length Supply Line 3/8 in. 32 ft. (9.7m) 6 ft. (1.8 m) 8 Maximum Rise Maximum 900 Elbows Maximum Tees Maximum Flow Numbers 2 22 SECTION IV - SYSTEM DESIGN UL EX. 3470 ULC CEx747 Page 4-47 10-1-02 REV. 2 LENGTH OF PIPING MUST NOT EXCEED 24 FT. (7.3 m) FROM START OF FIRST BRANCH LINE TO START OF LAST BRANCH LINE 2 FLOW APPUANCE NOZZLE (BRANCH LINES IN BOLD) COMBINED LENGlli MUST NOT EXCEED 36 FT. (10.9 m) . FIGURE 85 lIOO267 .;