@EXAIR For Technical Assistance, Call An EXAIR Application Engineer 1-800-903-9247 Toll Free FAX (866) 329-3924 • E-mail: [email protected] • www.exair.com 34 Air Knives Standard Air Knife Specifications The Standard Air Knife is available in ten standard lengths of 3", 6", 9", 12", 18", 24", 30", 36", 42" and 48" (76, 152, 229, 305, 457, 610, 762, 914, 1067 and 1219mm). This measurement refers to the airflow length. The overall length is 1" (25mm) longer. Special lengths up to 48" (1219mm) are available. Any number of Standard Air Knives may be installed across a given area. Compressed Air Inlets: A Standard Air Knife has compressed air inlets on each end. Lengths 24" (610mm) and longer should be supplied with compressed air at each end to maintain uniform airflow. Filtration: The use of clean air is essential. Kits include an automatic drain filter with a 5 micron filter element that is sized properly for flow. Materials of Construction: The Standard Air Knife is available in either aluminum or stainless steel construction. Mounting: See page 29 for complete details on the Universal Air Knife Mounting System. The Standard Air Knife can also be supported by the compressed air pipe. Regulation: A pressure regulator on the compressed air supply provides infinite control of flow, force, and air consumption. Kits include a pressure regulator that is sized properly for flow. Shim Sets: A Standard Air Knife has a .002" (0.05mm) gap setting. This gap is set with a shim positioned between the cap and body of the Standard Air Knife. Force and flow through the Standard Air Knife may be easily increased by adding shims to open the gap. Standard Air Knife Kits include a shim set (three additional shims). Shim sets for aluminum Standard Air Knives include a .001" (0.03mm) Amber color , .003" (0.08mm) Green color , and .004" (0.10mm) thick Tan color plastic shims. Shim sets for stainless steel Standard Air Knives include (3) .002" (0.05mm) thick stainless steel shims. Compressed air flows through the inlet (1) into a plenum chamber. It is then throttled through a thin nozzle (2) extending the length of the Standard Air Knife. This primary airstream adheres to the Coanda profile (3), which turns it 90° and directs the flow down the face of the unit. The primary stream immediately begins to entrain surrounding air (4), for an amplification ratio of 30:1 at 6" (152mm) away. How The Standard Air Knife Works 1 4 3 2 Standard Air Knife A Model 2006 6" (152mm) Standard Air Knife blows powder loose from a belt so it can be vacuumed away. Kits include a Standard Air Knife, shim set, filter separator, and pressure regulator (with coupler). Standard Air Knife Performance with .002" (0.05mm) thick shim installed Pressure Supply Air Consumption per Inch (25mm) Velocity @ 6” (152mm) from target Sound Level @ 3’ (914mm) Force per Inch (25mm) @ 6" (152mm) from target PSIG BAR SCFM SLPM FPM M/S dBA Ozs Grams 20 1.4 1.3 37 4,000 20.3 65 0.45 13 40 2.8 2.0 57 5,800 29.5 74 1.1 31 60 4.1 2.7 76 8,500 43.2 80 2.0 57 80 5.5 3.4 96 11,000 55.9 83 2.7 77 100 6.9 4.1 116 13,000 66.0 86 3.3 94 12” (305mm) Standard Air Knife tested
