EXAIR Air Jets: Overview

Air Jet Family

EXAIR manufactures a variety of Air Nozzles and Jets to safely, efficiently and effectively blow compressed air. There are many different styles that can best fit specific applications. In this blog, I am going to discuss the EXAIR Air Jets. They are designed to entrain a high volume of ambient air to give a moderate blowing force. Similar to the Air Amplifiers, these miniature devices use very little compressed air to achieve an effective blowing for removing debris, drying parts, or cooling hot products. EXAIR manufactures two different styles, the High Velocity Air Jet and the Adjustable Air Jet.

The Air Jets use a Coanda profile for blowing. The Coanda effect was named after a Romanian aerodynamic pioneer, Henri Coanda who discovered a fluid flow phenomenon. He stated that “a jet of fluid emerging from an orifice to follow an adjacent flat or curved surface and to entrain fluid from the surroundings so that a region of lower pressure develops” (1). Since air is a fluid, it will react in the same manner. The EXAIR Air Jets create a high velocity air stream along an engineered profile. So, as the air “hugs” the profile, a low pressure is created which will draw in ambient air. The unique design of the Air Jet utilizes a ring jet of compressed air to produce that low pressure at the entrance, entraining the surrounding ambient air. This makes the Air Jet very efficient as it utilizes more ambient air than compressed air.

Depending on the environment or application, the Air Jets come in two types of material; brass and stainless steel. The High Velocity Air Jets use a shim to set a gap. The gap can be changed by installing a different thickness of shim to increase or decrease the blowing intensity. These shims in conjunction with a regulator gives versatility for a wide range of applications. If the desired blowing force needs to be changed for different types of products or flexibility is required “on the fly”, the Adjustable Air Jet would be recommended. It has a micrometer gap indicator to set the desired result. By twisting the plug of the Adjustable Air Jet, you can get output flows from a gentle breeze to a blast. What makes both Air Jets unique is the design. They meet the OSHA standard for noise level and dead-end pressure. If you block the output of the Air Jets, the pressure will not exceed the OSHA safety requirement for dead-end pressure. Also, the inlet and/or outlet can both be ducted for remote positioning.

Model 6013 High Velocity Air Jets help dry an engine casting

Our accessories can make the Air Jets easier to use.   We have Stay Set Hoses for easy connections and maneuverability. The Stay Set Hoses come in a variety of lengths from 6” (152mm) to 36” (915mm) and once you set the position, the Stay Set Hose will keep the Air Jet stationary even during blowing. You can add a Magnetic Base with the Stay Set Hose and Air Jet to mount the blowing unit right to a metal fixture. It has a 100 lb. (45.5Kg) pulling force to keep the Air Jet from moving until you need to move it. The bases come with a ¼ turn shut-off valve and in a single or dual output configuration. In addition to the above accessories, we also offer a model 9040 Foot Pedal valve for operator control of the duration of blowing with their foot, allowing the use both of their hands.

With the cost to make the compressed air utility being so high, it is important to use it as efficiently as possible. The High Velocity Air Jet and Adjustable Air Jet have the ability to give you effective blowing for removing debris, drying parts, or cooling objects without using a large amount of compressed air. With the accessory items included, you can set up an improved blowing station that will be effective, quiet, and efficient for your operators. The Air Jets are flexible and adaptable to be used in numerous types of blowing applications. If you have any questions about the Air Jets or if you would like to discuss any applications, you can contact an Application Engineer at EXAIR.

John Ball, Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb


(1) Note: Coanda effect by Wikipedia.org

Back Blow Air Nozzles Clean Inside Diameters

They say time flies when you’re having fun. Maybe that’s why I found it a little hard to believe it’s been almost two years since we introduced the Back Blow Air Nozzles. They’ve become yet another “textbook” solution to a great many applications:

*Model 1004SS M4 Back Blow Air Nozzles are used to dry the inside of a closed cylinder after a zinc bonding process.  They’re also fitted to Model 1204SS-12-CS M4 Back Blow Safety Air Gun to remove chips & cutting fluid from freshly cut pipe ends.

*Our Model 1006SS 1/4 NPT Back Blow Air Nozzle won Plant Engineering Magazine’s “Product Of The Year” Bronze Award in 2015, and are successfully employed in a wide range of uses:

  • Blowing out splined bores by a gear manufacturer
  • Quickly cleaning out spindles between tool changes by a CNC machinery operator
  • Removing the last bits of powder from spent toner cartridges by a printing equipment recycler

*The Model 1008SS 1 NPT Back Blow Air Nozzle is becoming famous in hydraulic cylinder repair shops…after a cylinder bore is honed, one quick pass of the powerful blast it produces cleans bores from 2″ to 16″.  We can even put it on the Model 1219SS Super Blast Back Blow Safety Air Gun, with a 1ft, 3ft, or 6ft extension.

EXAIR Back Blow Air Nozzles come in three sizes, for bores from 1/4″ to 16″ in diameter!

If you want to see how they work, check out this video:

I could have sworn Lee Evans just made that video, but apparently, it’s over a year old now.  Time does indeed fly, and I promise we’re having fun!  If you’d like to find out more about how a Back Blow Air Nozzle – or any of our engineered compressed air products (old or new) – can make your operations quieter, more efficient (and hence, probably, more fun,) give me a call.

Russ Bowman
Application Engineer
Find us on the Web
Follow me on Twitter
Like us on Facebook

The Old One-Two: Super Air Knives And Super Air Nozzles

The EXAIR Super Air Knife is THE ideal, efficient, and quiet solution for most any blow off application. We know this for a fact; we’ve been making them for years, folks all around the world have been buying them for years, and they keep coming back for more. They’re popular enough that over the years, we’ve introduced Mounting Systems and Plumbing Kits for ease of installation, and when Coupling Kits (to join multiple Super Air Knives together for greater lengths) became big sellers, we “upped our game” and started making Super Air Knives up to nine feet (108″) long. And certain applications (I’m looking at YOU, lumber and paper industries) order multiples of THOSE, and our Coupling Kits. Quite literally, there’s no job too big for EXAIR Super Air Knives.

EXAIR Super Air Knifes come in a wide variety of lengths to suit a wide range of applications.

No matter how long they are, though, the laminar, high velocity curtain of air they generate only moves in one direction. So, if there are significant geometric features (holes, bosses, recesses, “nooks & crannies,” etc.) to be blown off, we’ll have to look at something supplemental.

Enter the EXAIR Blowoff Systems…it doesn’t get any easier than this: an EXAIR engineered Super Air Nozzle, attached to a flexible, repositionable Stay Set Hose, mounted to a Magnetic Base.  Put a hard hitting, high velocity, pointed flow of air right where you want it.  If the next piece is different, that’s no problem – just bend the hose to re-aim the air flow.

Mag Bases come with one or two outlets. Stay Set Hoses come in lengths from 6″ to 36″.

No matter what the requirements of your blow off application are, we have an efficient, quiet, and safe solution.  If you’d like to find out more, give me a call.

Russ Bowman
Application Engineer
Find us on the Web
Follow me on Twitter
Like us on Facebook

Proper Supply Line Size And Fittings Provide Peak Performance

Many times when we provide the air consumption of an EXAIR product, we get a response like…. “I’ve got plenty of pressure, we run at around 100 PSIG”. While having the correct pressure available is important, it doesn’t make up for the volume requirement or SCFM (Standard Cubic Feet per Minute) needed to maintain that pressure. We commonly reference trying to supply water to a fire hose with a garden hose, it is the same principle, in regards to compressed air.

When looking to maintain an efficient compressed air system, it’s important that you use properly sized supply lines and fittings to  support the air demand (SCFM) of the point-of-use device. The smaller the ID and the longer the length of run, it becomes more difficult for the air to travel through the system. Undersized supply lines or piping can sometimes be the biggest culprit in a compressed air system as they can lead to severe pressure drops or the loss of pressure from the compressor to the end use product.

Take for example our 18″ Super Air Knife. A 18″ Super Air Knife will consume 52.2 SCFM at 80 PSIG. We recommend using 1/2″ Schedule 40 pipe up to 10′ or 3/4″ pipe up to 50′. The reason you need to increase the pipe size after 10′ of run is that 1/2″ pipe can flow close to 100 SCFM up to 10′ but for a 50′ length it can only flow 42 SCFM. On the other hand, 3/4″ pipe is able to flow 100 SCFM up to 50′ so this will allow you to carry the volume needed to the inlet of the knife, without losing pressure through the line.

Pipe size chart for the Super Air Knife

We also explain how performance can be negatively affected by improper plumbing in the following short video:


Another problem area is using restrictive fittings, like quick disconnects. While this may be useful with common everyday pneumatic tools, like an impact wrench or nail gun, they can severely limit the volumetric flow to a device requiring more air , like a longer length air knife.

1/4″ Quick Connect

For example, looking at the above 1/4″ quick disconnect, the ID of the fitting is much smaller than the NPT connection size. In this case, it is measuring close to .192″. If you were using a device like our Super Air Knife that features 1/4″ FNPT inlets, even though you are providing the correct thread size, the small inside diameter of the quick disconnect causes too much of a restriction for the volume (SCFM) required to properly support the knife, resulting in a pressure drop through the line, reducing the overall performance.

If you have any questions about compressed air applications or supply lines, please contact one of our application engineers for assistance.

Justin Nicholl
Application Engineer

Getting A Little More Vacuum and Flow

Last week, a customer called and indicated that he was a long time user of the model 6013 High Velocity Air Jet.

Model 6013 High Velocity Air Jet

The customer was using the Air Jet to remove light trim scrap from a manufacturing process. The Air Jets utilize the Coanda effect (wall attachment of a high velocity fluid) to produce air motion in their surroundings.  A small amount of compressed air to the Air Jet is throttled through an internal ring nozzle at speeds above sonic velocity.  In the above image, this produces a vacuum at the left side, pulling in large volumes of surrounding air. By utilizing this vacuum pull and ducting the right side exhaust, air and scrap stream to a collection area. The customer assembled a small, efficient, and inexpensive scrap removal system.

The reason the customer had called in was there were some recent changes to the manufacturing process and needed a bit more vacuum force and flow to handle larger scrap and longer travel. We explored using a larger shim, but they were already using the largest size (0.015″.) We talked about the other products that EXAIR offers (Air Amplifiers, Line Vacs) that are used for scrap removal and conveyance.  But with any change, there are usually other modifications and approvals that must be dealt with in order to proceed. So we hit upon the Adjustable Air Jet, which is an adjustable version of the model 6013.

Model 6019 Adjustable Air Jet

The model 6019 Adjustable Air Jet utilizes an adjustable air gap in place of the fixed shim thickness.  This allows for greater air flow, which results in greater vacuum and conveyance distances. As is the case for many customers, we gathered some additional data to help this customer make a decision. We set up each of the units and tested them at maximum capabilities, and the model 6019 was shown to deliver upwards of 50% greater flow.  The customer felt certain this level of performance would handle what the changed process would require, and best of all, no modifications to any part of the set-up would be required, simply install the 6019 where the 6013 was currently placed.

The High Velocity Air Jet is also part of the model 1909 Blowoff Kit, and is also used in the model 8193 Ion Air Gun and model 8194 Ion Air Jet, for Static Elimination applications. Of course, each can be purchased as an individual item.

To discuss your application and how an EXAIR Intelligent Compressed Air Product can make your process better, feel free to contact EXAIR and myself or one of our other Application Engineers can help you determine the best solution.

Brian Bergmann
Application Engineer

Send me an email
Find us on the Web
Like us on Facebook
Twitter: @EXAIR_BB


Can Counting Carbs Help in Your Compressed Air System?

Breakfast Cereal
Breakfast Cereal

Have you ever counted the amount of carbs that you eat?  People typically do this to lose weight, to become healthier, or for medical reasons like diabetes.  Personally, I like to eat cereal in the morning.  I will pull a box of cereal down from the cupboard and look at the Total Carbs field.  One morning, I looked at a box of gluten-free rice flakes and compared it to a peanut butter nugget cereal.  I noticed that the carbs were very similar.  The rice cereal had 23 grams of total carbs while the peanut butter nuggets had only 22 grams of total carbs.  Then I looked at the serving size.  The rice cereal had a serving size of 1 cup while the nuggets only had a serving size of ¾ cups.  So, in comparison, for one cup of nugget cereal, the total amount of carbs was 27.5 grams.  Initially, I thought that they were similar, but the peanut butter nugget was actually 20% higher in carbs.  This same “misdirection” occurs in your compressed air system.

Here is what I mean. Some manufacturers like to use a lower pressure to rate their products.  This lower pressure makes it seem like their products will use less compressed air in your system.  But, like with the serving sizes, it can be deceiving.  It is not a lie that they are telling, but it is a bit of misconception.  To do an actual comparisons, we have to compare the flow rates at the same pressure (like comparing the carbohydrates at the same serving size).  For example, MfgA likes to rate their nozzles at a pressure of 72.5 PSIG.  EXAIR rates their nozzles at 80 PSIG as this is the most common pressure for point-of-use equipment.  You can see where I am going with this.

To compare nozzles of the same size, MfgA nozzle has a flow rate of 34 SCFM at 72.5 PSIG, and EXAIR model 1104 Super Air Nozzle has a rating of 35 SCFM at 80 psig. From an initial observation, it looks like MfgA has a lower flow rating.  To do the correct comparison, we have to adjust the flow rate to the same pressure.  This is done by multiplying the flow of MfgA nozzle by the ratio of absolute pressures.  (Absolute pressure is gage pressure plus 14.7 PSI).  The ratio of absolute pressures is:  (80PSIG + 14.7) / (72.5PSIG + 14.7) = 1.09.  Therefore; the flow rate at 80 PSIG for MfgA nozzle is now 34 SCFM * 1.09 = 37 SCFM.  Now we can compare the flow rates for each compressed air nozzle.  Like adjusting the serving size to 1 cup of cereal, the MfgA will use 9% more compressed air in your system than the EXAIR model 1104 Super Air Nozzle.  This may not seem like much, but over time it will add up.  And, there is no need to waste additional compressed air.

Family of Nozzles
Family of Nozzles

The EXAIR Super Air Nozzles are designed to entrain more ambient air than compressed air needed. This will save you on your pneumatic system, which in turn will save you money.  The other design features gives the EXAIR Super Air Nozzle more force, less noise, and still meet the OSHA compliance.

If you want to run a healthier compressed air system, it is important to evaluate the amount of compressed air that you are using. To do this correctly, you always want to compare the information at the same pressure.  By using the EXAIR Super Air Nozzles in your compressed air system, you will only have to worry about your own weight, not your pneumatic system.

John Ball
Application Engineer
Email: johnball@exair.com
Twitter: @EXAIR_jb


Picture: Breakfast Cereal by Mike Mozart Creative Commons Attribution 2.0 Generic License

FREE TESTING!!!! EXAIR’s Award Winning Efficiency Lab Saves Air and Money

EXAIR’s Efficiency Lab is now the “award-winning Efficiency Lab”. Thank you to Environmental Protection Magazine for recognizing the value and importance of this EXAIR service.



I have blogged about this many times and we continue to help customers by using our free Efficiency Lab service that EXAIR provides to customers throughout the USA.  The EXAIR Efficiency Lab allows customers to send in their existing blow off device and we will test it for compressed air consumption, sound level, and force.  Ideally we try to take these measurements at the same operating pressure that is being supplied in the field so that we can compare it to an EXAIR product and offer the customer the best solution, the safest solution, and an engineered solution capable of saving them money through air savings and effectiveness.

Here is a recent example of  a product sent in by a customer concerned with compressed air consumption and safety of their people. The  hose they sent in was actually designed to be used with liquid coolants and was a very large consumer of compressed air.

A flexible blow off with .495" openings. Designed for liquid but used for compressed air. Enormous waste of air and a huge safety risk.
A flexible blow off with .495″ openings. Designed for liquid but used for compressed air. Enormous waste of air and a huge safety risk.

The hose shown above was being used at 40 psig inlet pressure.  The device is not OSHA compliant for dead end pressure, nor does it meet or exceed the OSHA standard for allowable noise level exposure.   The hose was utilizing 84.64 SCFM of compressed air and was giving off 100.1 dBA of sound.

OSHA Noise Level

As seen in the chart above, an employee is only permitted to work in the surrounding area for 2 hours a day when exposed to this noise level.   The amount of force that the nozzle gave off was far more than what was needed to blow chips and fines off the part.   The EXAIR solution was a model 1002-9230 – Safety air Nozzle w/ 30″ Stay Set Hose.

The EXAIR products were operated at line pressure of 80 psig which means they utilized 17 SCFM of compressed air and gave off a sound level of 80 dBA.  On top of saving over 67 SCFM per nozzle and reducing the noise level to below OSHA standard, the EXAIR engineered solution also meets or exceeds the OSHA standard for 30 psig dead end pressure.   In total this customer has replaced 8 of these inefficient lines and is saving 541 SCFM of compressed air each time they activate the part blowoff.

If you would like to find out more about the EXAIR Efficiency Lab, contact an Application Engineer.

We look forward to testing your blow off and being able to recommend a safe, efficient, engineered solution.

Brian Farno
Application Engineer Manager