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52 – High Velocity Headers and Branches Example 6 – Use of Branch Duct Sizing Chart Given: Office building riser as shown in Fig. 5 in. wg Find: Duct size for Section 1 thru 6, Fig. 53. Solution: 1. Sketch branch as shown in Fig. 53. Enter appropriate values in column 2, 3 and 8, Fig. 54. 2. Enter Chart 12 at the velocity range recommended for branch risers with a 90° conical tee, page 52. Fig. 53 – Branch Duct for Example 6 3. Intersect the initial branch air quantity, 1200 cfm, as shown at point A.

Air Distribution | Chapter 2. Air Duct Design Normally a 10% leakage allowance is used if the complete duct is outside the room. Since a large portion of the duct is within the room, 5% is used in this example. 2. Determine the temperature rise from A to B: Select an initial staring velocity from Table 7 (assume 1400 fmp). Calculate the temperature rise from the fan to the room. 27 degrees temperature change per 100 ft per degree F difference. 2 3. Determine cfm for outlet C: Use equal friction method to determine velocity in second section of duct, with 1540 – 492 = 1048 cfm; velocity = 1280 fpm.

25 in. wg in Fig. 54 for section 1. 6. Determine equivalent length from the header to the first air terminal take-off: Fig. 54 – High Velocity Branch Sizing Calculations Part 2. Air Distribution | Chapter 2. Air Duct Design 7. 8. 9. 10. 11. 12. 13. 14. 15. Length of pipe = 6 + 12 = 18 ft. One 7 in. 3 ft. 3 ft. 89 in. wg. Determine duct size for section 2: From point A on Chart 12, project thru point B and C to the 1000 cfm line at point D. Determine equivalent length for section 2: Actual duct length = 12 + 2 = 14 ft.

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