An Air Knife is a high-efficiency industrial tool designed to create a powerful, uniform sheet of high-velocity air used for surface drying, cooling, and debris removal. Supreme Air Products™ air knives are precision-engineered and utilize the Coanda effect to entrain surrounding ambient air, amplifying the total airflow up to 40 times while significantly reducing compressed air consumption and noise.
At Supreme Air Products™, our air knife systems are revolutionizing industrial cleaning and drying processes. An air knife uses a high-velocity, uniform sheet of air to remove moisture, debris, and contaminants from products or surfaces with exceptional efficiency. Ideal for applications in manufacturing, food processing, and packaging, our air knives reduce energy costs, enhance product quality, and speed up production lines. By implementing our air knife technology, you can achieve a cleaner, more consistent finish, all while minimizing downtime and reducing waste. Trust Supreme Air Products to deliver cutting-edge solutions that optimize your operations and boost your bottom line.
The Supreme Air Products™ Air Knife Systems are offered in two models – regular and supreme. The Regular Air Knife is cost efficient and provides a 30:1 air amplification ratio with air consumption of 3.4 CFM per inch at 80 PSI. The Supreme Air Knife provides the most efficient performance with a 40:1 air amplification ratio and lower air consumption of 2.9 CFM per inch at the same pressure. The Supreme Air Knife also produces lower noise levels, making it the top choice among our clients.
 |
 |
|
|---|---|---|
|
|
Supreme Air Knife |
Regular Air Knife |
|
Air consumption @80 PSIG |
~2.9 SCFM per inch |
~3.4 SCFM per inch |
|
Air amplification ratio |
40:1 |
30:1 |
|
Corrosion Rating |
Excellent |
Excellent |
|
Material |
Aluminum & Stainless Steel |
Aluminum & Stainless Steel |
|
Noise level |
Low |
Medium |
|
Available Sizes |
2″ (51mm) up to 54″ (1372 mm) |
3″ (76mm) up to 54″ (1372 mm) |
|
Custom size available |
Yes |
Yes |
|
Temperature Rating |
400°F (204°C) |
275°F (135°C) |
Regular and supreme air knife systems are available in aluminum or stainless-steel construction and provide quality laminar flow. While our competitors opt for plastic shims and metal screws, Supreme Air Products™ takes pride in the quality of its products and uses only stainless-steel shims and screws to ensure durability and longevity. This is why we can offer a industry leading 8 Year warranty with a piece of mind.
The Supreme Air Products™ Air Knife Systems feature multiple ¼-20 mounting holes at the rear face for quick and easy installation. We also offer an optional air knife mount on a magnetic base which is equipped with an on/off switch. All Air Knife Systems come pre-installed with a 0.002” shim which is optimal for most applications, however additional shims can be installed for heavy duty wiping, cooling and drying as needed. Our Air Knife Systems are stocked in a variety of sizes. For custom sizes, multiple air knives can be joined together end-to-end and secured with an optional bracket. Since our air knife systems are full flow, joining 2 or more air knives together will produce one continuous air stream without interruption.
Size:
We offer both Regular and Supreme Air Knives in aluminum and stainless-steel construction. The following 12 sizes are in stock and ready to ship: 3″ (76 mm), 6″ (152 mm), 8″ (203 mm), 9″ (229 mm), 12″ (305 mm), 18″ (457 mm), 24″ (610 mm), 30″ (762 mm), 36″ (914 mm), 42″ (1067 mm), 48″ (1219 mm), and 54″ (1372 mm). Custom sizes available upon request.
Material:
Air Knife Unit: Aluminum or Stainless Steel
Shims: Stainless Steel
Screws: Stainless Steel
Mounting:
Along the rear side of the air knives there are multiple ¼”-20 mounting holes that allow for easy installation without disassembling the unit. We offer an optional Air Knife Mount that can be found in our “Accessories” section. Ridged compressed air pipe can also support your Air Knife!
Compressed Air Inlet(s)
Supreme Air Knife incorporates air inlet(s) located at each end (excluding 3″/76mm models) and on the back to allow flexible air use, air inlet choice, and high flow to higher force jets.
Air Supply Filtration
To achieve the best performance, it’s vital to use a clean and dry source of compressed air. We recommend using a Supreme Air Products™ 5-micron auto-drain filter, which is properly sized in order to avoid airflow restrictions.
| 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 |
Ounces |
Grams |
|
20 |
1.4 |
1.3 |
36 |
5,000 |
25 |
56 |
0.6 |
17 |
|
40 |
2.8 |
1.7 |
48 |
7,000 |
36 |
61 |
1.1 |
31 |
|
60 |
4.1 |
2.1 |
59 |
9,600 |
49 |
65 |
1.8 |
51 |
|
80 |
5.5 |
2.9 |
82 |
11,800 |
60 |
68 |
2.5 |
71 |
|
100 |
6.4 |
3.3 |
93 |
13,500 |
69 |
71 |
3.2 |
91 |
with .002″ (.05mm) thick shim installed. 12″ (305mm) Supreme Air Knife tested.
| 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 |
Ounces |
Grams |
|
20 |
1.4 |
1.5 |
42 |
4,000 |
20 |
64 |
0.5 |
14 |
|
40 |
2.8 |
2.1 |
60 |
5,800 |
30 |
73 |
1.2 |
34 |
|
60 |
4.1 |
2.7 |
77 |
8,500 |
43 |
80 |
2.0 |
57 |
|
80 |
5.5 |
3.5 |
99 |
11,000 |
56 |
83 |
2.8 |
79 |
|
100 |
6.4 |
4.1 |
16 |
13,000 |
66 |
86 |
3.3 |
94 |
with .002″ (.05mm) thick shim installed. 12″ (305mm) Supreme Air Knife tested.
Drilled Pipe Air Consumption: Chart
*Compressed Air Flow in Standard Cubic Feet Per Minute (SCFM)
| 1/16″ (1.59mm) Diameter Hole | 3/32″ (2.38mm) Diameter Hole | 1/8″ (3.18mm) Diameter Hole | 3/16″ (4.76mm) Diameter Hole | 1/4″ (6.35mm) Diameter Hole | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
PRESSURE SUPPLY |
SCFM |
SLPM |
SCFM |
SLPM |
SCFM |
SLPM |
SCFM |
SLPM |
SCFM |
SLPM |
|
20 PSIG (1.4 Bar) |
1.5 |
42.4 |
3.4 |
96.2 |
6.3 |
178.3 |
14.7 |
416.0 |
26.0 |
735.8 |
|
40 PSIG (2.8 Bar) |
2.1 |
65.0 |
5.5 |
155.7 |
10.1 |
285.8 |
23.0 |
650.9 |
40.0 |
1132.0 |
|
60 PSIG (4.1 Bar) |
3.1 |
87.7 |
7.5 |
212.3 |
14.2 |
401.9 |
31.0 |
877.3 |
54.0 |
1528.2 |
|
8080 PSIG (5.5 Bar) |
3.9 |
110.4 |
9.4 |
266.0 |
17.5 |
495.3 |
40.0 |
1132 |
70.0 |
1981.0 |
|
100 PSIG (6.4 Bar) |
4.6 |
130.2 |
11.7 |
331.1 |
21.7 |
614.1 |
47.5 |
1344.3 |
83.0 |
2348.9 |
|
120 PSIG (8.4 Bar) |
5.4 |
152.8 |
13.9 |
393.4 |
25.9 |
733.0 |
56.3 |
1593.3 |
96.0 |
2716.8 |
Many of our clients don’t know this, but using a drilled pipe is one of the most expensive and ineffective way to utilize compressed air. As you can see in the above table chart performed in our tests, the drilled pipe performs poorly. Because of its hight compressed air use, drilled pipe cost is quickly overtaken and does not pay off. Besides that, OSHA noise level requirements are not fulfilled and holes located on the drilled pipe can quickly become blocked. Because of the nature of the drilled pipe, airflow that goes across the entire length of the drilled pipe unit is not uniformed and can result in many dead spots and big spikes of air.
Our Air Knives are engineered exclusively for use with compressed air. Blowers generally lack the pressure required to achieve the high-velocity discharge these knives are designed for. Furthermore, blowers tend to be significantly bulkier, noisier, and require larger plumbing connections (typically 3”–6”) compared to streamlined compressed air setups.
Because our Air Knives are precision-machined to exacting tolerances, they cannot be cut or modified in the field. Altering the unit would compromise the internal chambers and permanent seals, making it impossible to restore the engineered airflow.
The good news: We specialize in custom solutions! If our standard sizes don’t fit your application, we can manufacture a custom-length Air Knife built specifically to your requirements.
Yes, the output force can be adjusted by increasing the total volume of air passing through the unit. This is typically achieved in two ways:
Adjust Manifold Pressure: Increase the supply pressure at your regulator (not to exceed the maximum safe operating limit of 250 PSIG).
Expand the Air Gap: Install additional shims to increase the internal gap. This allows a higher volume of air to exit the knife, resulting in greater mass flow and force.
Replacement shim sets and high-performance accessories can be found in our [Accessories Section].
Regardless of the application, we recommend operating the Air Knife at the lowest pressure necessary to achieve the desired result. Using a pressure regulator is strongly advised to precisely control and adjust airflow until your application requirements are met.
The maximum allowable operating pressure for our Air Knife is 250 PSIG. Operating beyond this limit is not recommended.
For maximum stability, we recommend mounting the Air Knife to a rigid compressed air supply pipe. This ensures secure positioning and consistent performance.
If this is not feasible for your setup, the Air Knife is equipped with multiple 1/4-20 threaded mounting holes located on the back of the unit, allowing for alternative mounting configurations.
Accessories:
For added flexibility and easier installation, we also offer an optional magnetic base Air Knife mount. This accessory allows for quick positioning and secure attachment to suitable metal surfaces within your production line.
Yes. While 54” is our largest standard size, we can manufacture Air Knives up to 109” in a single unit. We can also custom machine virtually any length upon special request to meet your application requirements.
Additionally, our Air Knives feature a full-flow design, meaning two or more units can be coupled together without interrupting the continuous air sheet. This allows you to achieve extended coverage while maintaining uniform airflow performance.
Accessories:
Multiple Air Knives can be securely joined using our optional coupling bracket, available in the Accessories section.
The allowable operating temperature range depends on the material of construction:
Aluminum Air Knife: Up to 275°F (135°C)
Stainless Steel (Type 303) Air Knife: Up to 400°F (204°C)
Stainless Steel (Type 316) Air Knife: Up to 800°F (427°C)
Operating temperatures above 800°F (427°C) may cause intergranular corrosion, which can damage the Air Knife and potentially obstruct the air gap opening.
Before increasing the standard .002” gap opening by adding shims, it is essential to verify that the Air Knife is operating properly. Reduced airflow can often be caused by factors such as a clogged filter, restricted air lines, or an undersized air compressor.
To confirm that full line pressure is reaching the unit, we recommend installing a pipe tee with a pressure gauge at any available Air Knife inlet. This will allow you to verify that the proper supply pressure is present.
If full line pressure is confirmed and additional airflow is still required, turn off the compressed air supply and carefully disassemble the Air Knife. Before reassembly with an additional shim, thoroughly clean all components, including the Air Knife body, cap, and shim.
When reassembling, ensure that each screw is tightened evenly to 7.5 ft-lbs of torque.
Every Air Knife is thoroughly tested before leaving our facility to ensure proper and uniform airflow. If you experience dead spots, please review the following possible causes:
Clogging or contamination:
Inspect the Air Knife for debris or internal contamination that may be obstructing airflow. If cleaning is required, please follow the instructions provided in the Installation and Maintenance Manual included with your purchase.
Overtightened screws:
Screws that are overtightened during installation or mounting can distort the unit and affect airflow uniformity. Ensure all screws are tightened evenly to 7.5 ft-lbs of torque.
Restricted air supply:
Undersized air lines, clogged filters, or restrictive fittings can limit airflow entering the Air Knife plenum chamber. Verify that your air supply system is properly sized and free of restrictions.
If the issue persists after these checks, please contact our technical support team for further assistance.
How to dry fruits before packaging
SUPREME AIR KNIFE
|
AIR KNIFE SIZE Aluminum & Stainless |
XX Inches (mm) |
X1 Inches (mm) |
X2 Inches (mm) |
Y1 Inches (mm) |
NUMBER OF AIR INLETS |
|---|---|---|---|---|---|
|
2″ AIR KNIFE |
2″ (50.8) |
N/A
|
N/A
|
1″(25.4)
|
1(0)
|
|
3″ AIR KNIFE |
3″ (76.2)
|
0.641″(16.3)
|
N/A
|
1.5″(38.1)
|
1(0)
|
|
6″ AIR KNIFE |
6″ (152)
|
1″(25.4)
|
2″(50.8)
|
3″ (76.2)
|
1(2)
|
|
8″ AIR KNIFE |
8″(203.2)
|
1″(25.4)
|
2″(50.8)
|
3″ (76.20)
|
2(2)
|
|
9″ AIR KNIFE
|
9″(228.6)
|
1″(25.4)
|
2″(50.8)
|
3″(76.2)
|
2(2)
|
|
12″ AIR KNIFE
|
12″(304.8)
|
1″(25.4)
|
2″(50.8)
|
3″(76.2)
|
2(2)
|
|
18″ AIR KNIFE
|
18″(457.2)
|
1″(25.4)
|
2″(50.8)
|
5″(127.0)
|
2(2)
|
|
24″ AIR KNIFE
|
24″(609.6)
|
1″(25.4)
|
2″(50.8)
|
6’152.4)
|
2(2)
|
|
30″ AIR KNIFE
|
30″(762)
|
1″(25.4)
|
2″(50.8)
|
6″(152.4)
|
2(2)
|
|
36″ AIR KNIFE
|
36″(762)
|
1″(25.4)
|
2″(50.8)
|
6″(152.4)
|
2(2)
|
|
42″ AIR KNIFE
|
42″(1066.8)
|
1″(25.4)
|
2″(50.8)
|
6′(152.4)
|
2(2)
|
|
48″ AIR KNIFE
|
48″(1219.2)
|
1″(25.4)
|
2″(50.8)
|
9″(228.6)
|
3(2)
|
|
54″ AIR KNIFE
|
54″(1371.6)
|
1″(25.4)
|
2″(50.8)
|
9″(228.6)
|
3(2) |
REGULAR AIR KNIFE
|
AIR KNIFE SIZE Aluminum & Stainless |
XX Inches (mm) |
X1 Inches (mm) |
X2 Inches (mm) |
X3 Inches (mm) |
X4 Inches (mm) |
Y1 Inches (mm) |
Y2 Inches (mm) |
NUMBER OF AIR INLETS |
|---|---|---|---|---|---|---|---|---|
|
3″ AIR KNIFE |
3″ (76.2)
|
.625″(15.9)
|
N/A
|
N/A
|
2.375″(60.3)
|
1.50″(38.1)
|
N/A
|
1(2) |
|
6″ AIR KNIFE |
6″ (152,4)
|
1″(25.4)
|
N/A
|
N/A
|
5.0″(12.7)
|
3″(76.2)
|
N/A
|
1(2) |
|
8″ AIR KNIFE |
8″(203.2)
|
1.187″(30.1)
|
2.37″(60.2)
|
5.63″(143)
|
6.813″(162)
|
4″(101.6)
|
N/A
|
1(2) |
|
9″ AIR KNIFE
|
9″(228.6)
|
1″(25.4)
|
2.37″(60.2)
|
5.63″(143)
|
7.813″(182)
|
5″(127)
|
N/A
|
1(2) |
|
12″ AIR KNIFE
|
12″(304.8)
|
1″(25.4)
|
3.1″(78.7)
|
8.9″(127)
|
11.0″(279)
|
6″(152)
|
N/A
|
1(2) |
|
18″ AIR KNIFE
|
18″(457.2)
|
1.33″(33.4)
|
5.8″(147.3)
|
12.2″(310)
|
16.7″(424)
|
4.25″(108)
|
13.75″(349)
|
2(2) |
|
24″ AIR KNIFE
|
24″(609.6)
|
1.33″(33.4)
|
4.2″(166.7)
|
19.8″(503)
|
22.7″(577)
|
7.3″(183)
|
16.7″(424)
|
2(2) |
|
30″ AIR KNIFE
|
30″(762)
|
1.33″(33.4)
|
10.92″(277.4)
|
19.08″(485)
|
28.87″(733)
|
7.68″(195)
|
22.34″(567)
|
2(2) |
|
36″ AIR KNIFE
|
6″(152.4)
|
1.09″(27.7)
|
10.75″(273.0)
|
18.75″(476)
|
34.92″(887)
|
7.53″(191)
|
28.47″(723)
|
2(2) |
|
42″ AIR KNIFE
|
42″(1066.8)
|
1.09″(27.7)
|
10.75″(273.0)
|
19.08″(485)
|
40.92″(1039)
|
7.68″(195)
|
34.47″(875)
|
2(2) |
|
48″ AIR KNIFE
|
48″(1219.2)
|
1.09″(27.7)
|
10.75″(273.0)
|
19.08″(485)
|
46.92″(1168)
|
7.68″(195)
|
40.47″(1028)
|
2(2) |
|
54″ AIR KNIFE
|
54″(1371.6)
|
1.09″(27.7)
|
10.75″(273.0)
|
19.08″(485)
|
52.92″(1320)
|
7.68″(195)
|
46.47″(1180)
|
2(2) |
