Full-Flow Air Knife2022-04-22T09:35:06+02:00

Full-Flow Air Knife™ – This low cost choice provides a curtain of air for blowoff, cleaning, drying and cooling.

Full-Flow Air Knife

What is the Full-Flow Air Knife?

EXAIR’s Full-Flow Air Knife is an effective way to clean, dry or cool parts, webs or conveyors. It utilizes the coanda effect to pull in large volumes of surrounding air, producing a high flow, high velocity curtain of air. The “Full-Flow” provides airflow across the entire length. A 12″ (305mm) Full-Flow Air Knife measures 12″ (305mm). It has the compressed air inlet(s) on the rear. Inlets are available on each end at a small additional charge but are not recommended when uniform airflow is required.

Specials are available. Please contact us!

Full-Flow 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
20 1,4 31 15,2 64 11
40 2,8 51 25,4 72 28
60 4,1 68 38,1 76 45
80 5,5 88 50,8 80 65
100 6,9 108 61,0 83 82
12″ (305mm) Full-Flow Air Knife Tested.
Note: Performance on lengths over 36″ will vary.

Aluminium Full-Flow Air Knife

Special Lengths Available – Contact us.

Aluminium Full-Flow Air Knife Dimensions

Steel Type 303SS Full-Flow Air Knife

Special Lengths Available – Contact us.

Steel Full-Flow Air Knife Dimensions
BSP Threads Available – Contact us.

Aluminum Full-Flow Air Knife Only
Full-Flow Air Knife Length Aluminium Stainless Steel
3″ (76 mm) 2603 2603SS
6″ (152 mm) 2606 2606SS
9″ (229 mm) 2609 2609SS
12″ (305 mm) 2612 2612SS
18″ (457 mm) 2618 2618SS
24″ (610 mm) 2624 2624SS
30″ (762 mm) 2630 2630SS
36″ (914 mm) 2636 2636SS

Shim Sets

A Full-Flow Air Knife has a .002″ (0.05mm) gap setting. This gap is set with a shim positioned between the cap and the body of the Full-Flow Air Knife. Force and flow through the Full-Flow Air Knife may be easily increased by adding shims to open the gap. Kits include a shim set. Shim sets for aluminum Full-Flow Air Knives include a .001″ (0.03mm), .003″ (0.08mm) and .004″ (0.10mm) thick plastic shim. Shim sets for stainless steel Full-Flow Air Knives include (1) .002″ (0.05mm) thick stainless steel shim.

Full-Flow Air Knife Shim Sets
Full-Flow Air Knife Shim Sets Length Aluminium Stainless Steel
3″ (76 mm) 2903 2903SS
6″ (152 mm) 2906 2906SS
9″ (229 mm) 2909 2909SS
12″ (305 mm) 2912 2912SS
18″ (457 mm) 2918 2918SS
24″ (610 mm) 2924 2924SS
30″ (762 mm) 2930 2930SS
36″ (914 mm) 2936 2936SS
More Accessories
Model Description
9060 Universal Air Knife Mounting System
9001 Automatic Drain Filter Separator, 3/8 NPT, 65 SCFM (1841 SLPM)
9032 Automatic Drain Filter Separator, 1/2 NPT, 90 SCFM (2548 SLPM)
9002 Automatic Drain Filter Separator, 3/4 NPT, 220 SCFM (6230 SLPM)
9005 Oil Removal Filter, 3/8 NPT, 15-37 SCFM (425-1048 SLPM)
9006 Oil Removal Filter, 3/4 NPT, 50-150 SCFM (1415-4248 SLPM)
9008 Pressure Regulator with Gauge, 1/4 NPT, 50 SCFM (1416 SLPM)
9033 Pressure Regulator with Gauge, 1/2 NPT, 100 SCFM (2832 SLPM)
9009 Pressure Regulator with Gauge, 3/4 NPT, 220 SCFM (6230 SLPM)
9020 Solenoid Valve Only, 120V, 50/60Hz, 1/4 NPT, 40 SCFM (1133 SLPM)
9021 Solenoid Valve Only, 200-240V, 50/60Hz, 1/4 NPT, 40 SCFM (1133 SLPM)
9034 Medium Solenoid Valve, 120V, 1/2 NPT, 100 SCFM (2832 SLPM)
9035 Medium Solenoid Valve, 240V, 50/60Hz, 1/2 NPT, 100 SCFM (2832 SLPM)
9036 Large Solenoid Valve, 120V, 3/4 NPT, 200 SCFM (5664 SLPM)
9037 Large Solenoid Valve, 240V, 50/60Hz, 3/4 NPT, 200 SCFM (5664 SLPM)
9065 Large Solenoid Valve, 24VDC, 1 NPT, 350 SCFM (9911 SLPM)
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.


What kind of temperature resistance due air curtains offer?2022-04-22T09:07:08+02:00
  • Air curtain made of aluminium with a plastic shim up to 82 °C
  • Air curtain made of aluminium with a stainless steel shim up to 205 °C (custom built)
  • Air curtain made of stainless steel with a stainless steel shim up to 427 °C*
  • Air curtain made of PVDF with a PVDF shim up to 135 °C

*Temperatures above 427 °C can cause intracrystalline corrosion which obstructs the air gap.

Why is the Air Knife’s (air curtain’s) airflow not uniform/laminar?2022-04-22T09:12:14+02:00

Our Air Knives are designed to deliver a uniform/laminar airflow from the outset. If this is not the case, there may be some soiling on the inside of the Air Knife. Please open and clean the Air Knife following the operating instructions.

For lengths of more than 18″, the air knife must be fed via multiple compressed air inputs (up to 6 inputs depending on the length) in order to ensure a uniform airflow. In the case of the PVDF Air Knife, the material can also cause changes in the homogeneity of the airflow.
A guide for restoring a uniform airflow is available here.

Is a hole not enough? Why should I use air curtains?2022-04-22T09:14:14+02:00

Did you know that a single 3-mm hole consumes as much compressed air as a Super Air Knife model with a length of 152 mm (6″)? Additionally, an air knife offers a low noise level (below 70 dBA given an unobstructed blow-off path) and does not have a dead end (safety at work).

The amortisation period if you replace holes with optimised blow-off nozzles is less than 6 months.

Can the compressed air products be operated with water?2022-04-22T09:19:41+02:00

To be able to answer this question, we need to investigate the specific use case. For example, the Super Air Knife could be operated with water to cool a workpiece or flush away loose residues. Experience shows that the water jet initially has a uniform outflow and then eddies further away from the air curtain. This means that use with water is possible.

If you need 360 ° wetting with water, we recommend our Super Air Wipe annular nozzle. The input pressure is up to 2 bar.

Of course, we also have legacy atomiser nozzles in various designs in our portfolio. They are suitable for cooling, washing, wetting, moistening, lubricating, etc.

We are happy to advise you on the right choice of product.