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Duct size - They used 6", 8", and 10" diameter round ducts. flex-duct-static-pressure-air-flow-losses-sag-lengths The table above shows the amount of sag for the different compression percentages and duct sizes. Note the highlighted cells. They point to the sag for the 6" duct, which is the size I'm going to focus on in this article. At low compression, the natural and long-term sag are the same. When you get up to 30% sag, though, they begin to diverge. At 45% compression, the 6" duct has 7" of natural sag and 11.5" of long-term sag. Support - They supported the flex duct in two ways. Either it was completely supported on a board, or it was supported on 1.5" wide joists that were 24" on center. The board-supported duct had only compression. The joist-supported duct had both compression and sag. Sag - With joist-supported duct, they looked at natural sag and long-term sag. The difference between the two is that long-term sag represents and extreme case. SAI INSULATION INDIA NO- 14, GROUND FLOOR, KALIKA NAGAR, ANDRALLI MAIN ROAD,NEAR PEENYA 2ND STAGE,BANGALORE - 58 Ajay 9738386050 9900190088 saiinsulationindia@gmail.com Delars in ROCKWOOL,MINERALWOOL,FIBER GLASSWOOL,LOOSE GLASSWOOL,NITTRIL RUBBER,ROCKWOOL LRB,XLPE FOAM, CERAMIC WOOL EXT
