Air-Flow Distribution
The bottom or side of the holes in the horizontal or vertical power, the ducts must be equipped with adjustable flow-alignment devices. Fig. 9.6 indicates pronounced one-way flow effect from the outlet. Before corrective impact of air-turning devices. Grid control is added to the Rice. 9.7 to equalize the flow in the take-off collar. In Vectrol is added to the Rice. 9.8 to turn the air in the branch canal and provide a volume control. Air-rotary device is recommended for installation on all sockets collars and branch pipes.
Area unvaned elbows, are also a source of poor duct distribution and high pressure loss. Uneven flow in the main channel, occurring after unvaned ell, seriously limits the possibilities for the distribution of air in the drainage canals, in the area of the elbow. On the one hand duct may be void, thus starving the branch duct. Conversely, all the thread can be stacked up on one side. This requires dampers to be too closed in higher noise levels.
Block diagrams show a pronounced turbulence and heaps of air flow in ell (see Fig. 9.9). So-it appears to reduce the pressure loss in the square elbows as much as 80 percent. Their corrective action is shown in Fig. 9.10.
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Air-Conditioning 
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