Standard Air Knife™ – Hard hitting curtain of air for web, sheet and part blowoff.

Standard Air Knife

What is the Standard Air Knife?

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.

Specials are available. Please contact us.

Why the Standard Air Knife?

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-back 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.

Drilled pipe or open jets, by contrast, provide minimal air amplification. They also produce unacceptably high noise levels as the compressed air shears into the still air.

Air Knives Perform Drying Cycle of Parts Washer

3 Model 2012 12″ (305mm) Standard Air Knives
perform the drying cycle in this parts washer.

How the Standard Air Knife works

Standard Air Knife Funktion

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.

  • Part drying after wash
  • Sheet cleaning in strip mills
  • Conveyor cleaning
  • Part or component cooling
  • Web drying or cleaning
  • Environmental separation
  • Bag opening/fill operations
  • Pre-paint blowoff
  • Scrap removal on converting operations
Air Knives Open Mustard Packets

A Model 2012 12″ (305mm) Standard Air Knife
opens mustard packets prior to fill.

  • Up to 10 dBA noise reduction
  • Reduced air consumption
  • 30:1 air amplification
  • Aluminum or stainless steel
  • Variable force and flow
  • Stock lengths to 48″ (1219mm)
  • Unlimited system lengths
  • No moving parts
  • Compact, rugged, easy to install

Air Flow Pattern

Standard Air Knife Luftströmungsfeld Leistung


Standard Air Knife Performance with .002″ (0.05mm) shim installed.

Pressure SupplyAir Consumption
per inch (25mm)
Velocity @
6″ (152mm)
from target
Sound level @ 3′ (914mm)Force per Inch (25mm)
@ 6″ (152mm) from target
12″ (305mm) Standard Air Knife Tested.
Note: Performance on lengths over 36″ will vary.

Aluminium Standard Air Knife

Special Lengths Available – Contact us.

Aluminium Standard Air Knife Dimensions

Stainless Steel Standard Air Knife

Special Lengths Available – Contact us.

Standard Air Knife Dimensions
BSP Threads Available – Contact us.

Standard Air Knife
Standard Air Knife LengthAluminum ModelStainless Steel Model
3″ (76 mm)20032003SS
6″ (152 mm)20062006SS
9″ (229 mm)20092009SS
12″ (305mm)20122012SS
18″ (457 mm)20182018SS
24″ (610 mm)20242024SS
30″ (762 mm)20302030SS
36″ (914 mm)20362036SS
42″ (1067 mm)20422042SS
48″ (1219 mm)20482048SS
Standard Air Knife Shim Sets
ModelAluminum ModelStainless Steel Model
3″ (76 mm)23032303SS
6″ (152 mm)23062306SS
9″ (229 mm)23092309SS
12″ (305 mm)23122312SS
18″ (457 mm)23182318SS
24″ (610 mm)23242324SS
30″ (762 mm)23302330SS
36″ (914 mm)23362336SS
42″ (1067 mm)23422342SS
48″ (1219 mm)23482348SS

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), .003″ (0.08mm) and .004″ (0.10mm) thick plastic shim. Shim sets for stainless steel Standard Air Knives include (3) .002″ (0.05mm) thick stainless steel shims.

9076Air Knife Plumbing Kit for Standard Air Knives size 24″-42″
9077Air Knife Plumbing Kit for Standard Air Knives size 28″-54″
9060Universal Air Knife Mounting System
900517Universal Air Knife Mounting System Stainless Steel 303/304
9055EFC (40 SCFM), 1/4″ NPT
9056EFC (100 SCFM), 1/2″ NPT
9057EFC (200 SCFM), 3/4″ NPT
9064EFC (350 SCFM), 1″ NPT
EXAIR’s EFC is an electronic flow control that dramatically reduces compressed air costs by turning off the compressed air when no part is present. This minimizes compressed air use for blow off, drying, cooling, conveying and static elimination operations. The EFC combines a photoelectric sensor with a timing control that limits compressed air use by turning it off when no part is present. Visit the EFC page for more information.