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Exair Standard Air Knife

Standard Air Knife™

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Hard hitting curtain of air for web, sheet and part blowoff.

A quiet, energy efficient way to clean, dry or cool parts, webs or conveyors. The Standard Air Knife utilizes the coanda effect (wall attachment of a high velocity fluid) to create air motion in its surroundings. Using a small amount of compressed air as a power source, the Standard Air Knife pulls in large volumes of surrounding air to produce a high flow, high velocity curtain of air for blowoff.

Printable PDF File

 Model 2012 12" (30cm) Standard
Air Knife opens mustard packets prior to fill.

Applications
  Advantages
 
  • Part drying after wash
 
  • Up to 10 dBA noise reduction
 
  • Sheet cleaning in strip mills
 
  • Reduced air consumption
 
  • Conveyor cleaning
 
  • 30:1 air amplification
 
  • Part or component cooling
 
  • Aluminum or stainless steel
 
  • Web drying or cleaning
 
  • Compact, rugged, easy to install
 
  • Environmental separation
 
  • Stock lengths to 36" (91cm)
 
  • Bag opening/fill operations
 
  • Unlimited system lengths
 
  • Pre-paint blowoff
 
  • No moving parts
 
  • Scrap removal on converting operations
 
  • Variable force and flow
 
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How the Standard Air Knife Works

Compressed air flows through the inlet (1) into a plenum chamber (2). It is then throttled through a thin nozzle (3) extending the length of the Standard Air Knife. This primary airstream adheres to the coanda profile (4), which turns it 90° and directs the flow down the face of the unit. The primary stream immediately begins to entrain surrounding air (5), for amplification ratios of 30:1 at 6" (15cm).

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Kits include an Air Knife, shim set,
filter separator and pressure regulator.

Amplification ratios (entrained air to compressed air) of 30:1 are achieved with the Standard Air Knife, compared to 3:1 for drilled or slotted pipe. Air savings of 40% to 90% are possible when replacing these "homemade" blowoff devices. Pay-out is normally measured in weeks, not months or years.

The Standard Air Knife dramatically reduces "wind shear" by gradually introducing the entrained air to the ejected compressed air. Noise level is typically cut in half. The result is a high velocity, high volume sheet of air with reduced noise level and air consumption.

Compare Blowoffs

Type of Blowoff

Air
Consumption
Sound
Level
Model #

Description

SCFM SLPM dBA
110018 18" (46cm)
Super Air Knife
52 1329 71
2018 18" (46cm)
Std. Air Knife
61 2234 87
N/A 18" (46cm)
drilled pipe*
141 3996 92
* drilled pipe has (37) 1/16" (1.59mm)
holes on 0.5" (13mm) centers
Specifications
The Standard Air Knife is available in six standard lengths of 6", 12", 18", 24", 30" and 36" (15, 30, 46, 61, 76 and 91cm). Special lengths up to 36" (91cm) and unlimited system lengths are available. Any number of Standard Air Knives may be installed across a given area.
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.
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" (.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. Kits include a shim set (three additional shims).
Standard Air Knife Performance with .002" (.05mm) thick shim installed
Pressure
Supply
Air Consumption
per Inch
Velocity @ 6"
from target
Sound level
@ 3'
Force per Inch
@ 6" from target
PSIG Bar SCFM SLPM FPM M/S dBA Ounces Grams
20 1.4 1.3 37 4000 20.3 69 0.45 13
40 2.8 2.0 57 5800 29.5 78 1.1 31
60 4.1 2.7 76 8500 43.2 84 2.0 57
80 5.5 3.4 96 11,000 55.9 87 2.7 77
100 6.9 4.1 116 13,000 66 90 3.3 94
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Front View Side View (Aluminum) Side View (Stainless Steel)
   

Standard Air Knives



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