Which Air Knife is Best for Your Application?

Which Air Knife is Best for Your Application?

EXAIR manufactures the Super Air Knife, Standard Air Knife and Full-Flow Air Knife. Below is a quick comparison of the three styles.

The Super Air Knife provides the best performance with a 40:1 air amplification ratio, making it the most efficient. It is the best choice for all applications. The Super Air Knife has a laminar airstream that is uniform, forceful and quiet. Velocity is the highest and air consumption is the lowest of all three styles of EXAIR Air Knives. Compressed air inlets are provided on each end and on the bottom. Multiple Super Air Knives can be mounted “end to end” for longer lengths of uninterrupted airflow.

  • Best choice for all applications
  • Lowest operating cost
  • Highest efficiency (saves most air)
  • Quietest
  • 40:1 air amplification ratio
  • Compressed air inlets on each end and the bottom
  • Airflow length and overall length are the same

The Standard Air Knife provides good performance with a 30:1 air amplification ratio that is less efficient than the Super Air Knife. It is a good choice when a less expensive alternative is required. The Standard Air Knife has an airflow that is also uniform and forceful. It is louder and uses more compressed air than the Super Air Knife. Compressed air inlets are provided on each end. Overall length is 1” (25mm) longer than the airflow length.

  • Good choice, lower purchase price
  • Highest operating cost of the three
  • Good velocity
  • Higher dBA rating
  • 30:1 air amplification ratio
  • Compressed air inlets on each end
  • Overall length is 1” (25mm) longer than the airflow length

The Full-Flow Air Knife provides good performance with a 30:1 air amplification ratio. It is a good choice for tight spaces. Force is less than the other two styles. Air consumption and sound level falls between that of the Super Air Knife and the Standard Air Knife. Compressed air inlets are provided on the rear. Inlets are available on each end at a small additional charge; however, they are not recommended for applications where uniform flow across the length is required.

  • Good choice
  • Higher operating cost than the Super Air Knife
  • Smallest size
  • 30:1 air amplification ratio
  • Airflow length and overall length are the same

Features & Benefits Comparison of EXAIR 6″ (152mm) Air Knife Lengths

  6″ (152mm) Super Air Knife 6″ (152mm) Standard Air Knife 6″ (152mm) Full-Flow Air Knife
  Aluminium Type 303 Stainless Steel Aluminium Type 303 Stainless Steel Aluminium Type 303 Stainless Steel
Length of air knife 6″ (152mm) 7″ (178mm) 6″ (152mm)
Length of airflow 6″ (152mm) 6″ (152mm) 6″ (152mm)
Profile dimensions H x W 37 x 45mm 26 x 37mm 31 x 35mm 37 x 32mm 26 x 25mm 25 x 32mm
Compressed air inlets Each end and bottom Each end only Rear only
Coupling possible Yes No No
Available materials of construction Aluminium

Type 303 Stainless Steel

Type 316 Stainless Steel

PVDF (Polyvinylidene Fluoride)

Aluminium

Type 303 Stainless Steel

 

Aluminium

Type 303 Stainless Steel

 

Sound level at 3′ (914mm) 69 dBA 83 dBA 80 dBA
Air consumption with .002″ thick shim installed 17.4 SCFM 20.4 SCFM 18.6 SCFM
Air amplification ratio 40:1 30:1 30:1
Velocity at 6″ (152mm) from target 59.9 m/s 55.9 m/s 50.8 m/s
Force per inch (25mm) at 6″ (152mm) from target 71 grams 77 grams 65 grams
Compressed air costs per annum
(assume $0.25 per 1000 SCF)
17.4 SCFM x 60 x 0.25/1000

= $0.261 per hour

= $10.44 per 40-hour week

= $542.88 per year

20.4 SCFM x 60 x 0.25/1000

= $0.306 per hour

= $12.24 per 40-hour week

= $636.48 per year

18.6 SCFM x 60 x 0.25/1000

= $0.279 per hour

= $11.16 per 40-hour week

= $580.32 per year

All measurements taken at 80 PSIG (5.5 BAR)

 

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