Tag: air jets

Blowoff Made Easy With the Variblast Safety Air Gun

Published on by jasonkirbyLeave a comment

EXAIR’s VariBlast Safety Air Guns provide a significant advancement in handheld blow off technology by effectively addressing the hazardous “all-or-nothing” airflow characteristic of conventional air blow guns. This innovative series combines precise, adjustable force control with top-tier safety standards, ensuring operator protection while significantly reducing costly compressed air consumption. Top that off with the fact that these units are actually repairable, and you have a win all the way around!

In standard industrial environments, inexpensive handheld air guns are often disregarded, despite being a significant source of hidden expenses stemming from high air consumption, potential hearing risks, and serious safety violations. To address these issues, EXAIR has developed the VariBlast series, which offers an efficient and ergonomic solution that easily adjusts to various tasks.

The VariBlast series is distinguished by its innovative variable-flow trigger mechanism. In contrast to inexpensive blow off guns that release a continuous and uncontrolled stream of compressed air, the specialized valve within the VariBlast adapts responsively to the user’s input.

The ergonomic trigger, when squeezed, progressively opens the internal valve, enabling operators to gently displace fine dust particles with a soft airflow or exert up to a full pound of force to completely blow away heavier debris. This precise control mechanism helps to avoid excessive use of compressed air, thereby significantly reducing utility expenses for the facility.

To tackle everything from heavy manufacturing to delicate electronics assembly, EXAIR offers the VariBlast blow gun in two distinct variations:

Meets or Exceeds OSHA Requirements
  • VariBlast Compact Safety Air Guns are constructed from robust cast aluminum, ensuring their resilience in demanding industrial environments. These air guns are equipped with dual 1/4 NPT inlets, making them suitable for connection with overhead tool retractors or counter balancers, and they can be paired with any of EXAIR’s 1/8 NPT Super Air Nozzles for enhanced functionality.
  • The VariBlast Precision Safety Air Guns are specifically designed for meticulous and detailed tasks, featuring a lightweight construction made from high-impact thermoplastic. This model is equipped with EXAIR’s three smallest engineered nozzle profiles, which include the ultra-compact Atto, the mid-range Pico, and the fine-point Nano, allowing for versatile applications in precision work.

Safety is not an afterthought with EXAIR; it is baked right into the engineering. Every VariBlast blow gun model completely bypasses standard factory penalties by natively fulfilling two essential OSHA mandates:

OSHA StandardSafety RequirementHow VariBlast Complies
29 CFR 1910.242(b)Restricts dead-end static pressure greater than 30 PSI if a nozzle is blocked.Engineered Super Air Nozzles maximize air entrainment and cannot be accidentally blocked or dead-ended by an operator’s hand.
29 CFR 1910.95(a)Protects operators against continuous industrial noise exposure over 90 dBA.Advanced nozzle geometry drops operation sound levels between 58 and 82 dBA—well within safe, permissible daily, 8-hour exposure thresholds.

If you have questions about our Variblast Safety Air Guns, or anything regarding EXAIR and our products, please do not hesitate to reach out.

Jason Kirby
Application Engineer
Email: jasonkirby@exair.com
Twitter: @EXAIR_jk

How to Reduce Blowoff Noise and Stay OSHA-Compliant

Published on by Al WooffittLeave a comment

Walk onto almost any factory floor, and you will hear a familiar, high-pitched hiss. Compressed air blow offs are essential for clearing chips, drying parts, and moving materials. However, standard open pipes, copper tubes, and cheap commercial air guns create an incredibly loud, turbulent environment.

If your facility is looking to lower its decibel levels, improve operator safety, and slash energy bills, the solution lies in upgrading to an engineered system like EXAIR Safety Air Guns.

Traditional blow offs—such as a crimped copper pipe or a basic thumb trigger gun—rely on forcing raw compressed air through a large, unrestricted opening. This design creates severe air shear and chaotic turbulence as the fast-moving air slams into the stagnant ambient air.

This turbulence results in two major consequences:

  1. Extreme Decibel Levels: Standard open-ended blow offs easily generate noise levels between 87 dBA to over 104 dBA. Under OSHA Standard 29 CFR 1910.95(a), exposure to these levels without hearing protection can quickly lead to permanent hearing damage or steep regulatory fines.
  2. Energy Inefficiency: Open pipes cause a severe pressure drop across the line, requiring massive amounts of compressed air (often 30 to 50 SCFM) just to maintain basic blowing force.
Hearing loss is the best known, but not the only, ill effect of harmful noise exposure. It can also cause physical and psychological stress, impair concentration, and contribute to workplace accidents or injuries.

EXAIR Safety Air Guns solve the noise problem by replacing this chaotic turbulence with engineered, laminar airflow. Instead of dumping raw compressed air directly into the environment, our guns utilize our specialized Super Air Nozzles. These nozzles eject a small amount of compressed air through a series of precise, engineered slots. This primary airstream creates a powerful vacuum effect that entrains large volumes of the surrounding ambient air.

The entrained ambient air forms a protective boundary layer that cushions the high-velocity core stream. By smoothing out the air shear, the noise level drops dramatically—often down to a whisper-quiet 68 to 82 dBA, well below OSHA’s strict 90 dBA threshold.

To put this into perspective, a decibel scale is logarithmic, meaning every 10 dBA increase represents a perceived doubling of loudness.

In a recent industrial case study, written about here on our blog, a manufacturing plant switched their open-ended blow off guns to the EXAIR Model 1250-12 Safety Air Gun. The results were immediate:

  • Before: Noise levels sat at a deafening 104 dBA while consuming 49 SCFM of compressed air.
  • After: Noise levels plummeted to 82 dBA (a 22 dBA reduction), and compressed air consumption dropped to 35 SCFM.

By making the switch, the factory successfully protected its workers’ hearing and significantly reduced its energy footprint.

In addition to reducing noise, upgrading to engineered guns provides total compliance with multiple other safety regulations:

  • OSHA Dead-End Pressure Compliance (29 CFR 1910.242(b)): If a worker accidentally blocks a standard open pipe against their hand or body, the air pressure can breach the skin and inject into the bloodstream, creating a fatal embolism. EXAIR nozzles are engineered with open aerodynamic profiles that cannot be dead-ended. If blocked, the air safely vents out of the sides, keeping dead-end pressure far below the 30 PSI limit.
  • Flying Debris Protection: When clearing chips from a CNC machine, debris can fly backward at the operator. These guns can be outfitted with clear EXAIR Chip Shields to form a physical protective barrier without blocking the line of sight.

Investing in engineered compressed air tools is a straightforward way to eliminate industrial noise pollution, protect your team, and improve your bottom line. If you would like to discuss how an engineered safety air gun from EXAIR can make a difference in your facility, then give me a call!

Al Wooffitt
Application Engineer

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Compressed Air Safety Fundamentals

Published on by jasonkirbyLeave a comment

Safety in the workplace is of paramount importance, and it is widely recognized that annual safety training is a common practice among organizations. A fundamental message from these training sessions is that safety is a collective responsibility, not limited to a select few. At EXAIR, we prioritize safety in all aspects of our operations. Our product line, particularly our Safety Air Guns, exemplifies this commitment, as they are engineered with safety considerations at the forefront. This emphasis on safety is critical, especially given the potential health hazards associated with the improper use of compressed air.

In the United States, the Occupational Safety and Health Administration (OSHA) is responsible for enforcing regulations that promote safe and healthy working conditions. This agency possesses the power to levy significant fines for any infractions. Among the frequent violations related to compressed air are those concerning air guns and blow-off devices, specifically detailed in 29CFR 1910.242(b), which addresses dead-end pressure and chip shielding, as well as 29CFR 1910.95(a), which pertains to permissible noise exposure levels.

The regulation 29CFR 1910.242(b) addresses the use of hand-held tools, particularly emphasizing that blow-off devices must not operate at pressures exceeding 30 PSIG when there is a risk of compressed air becoming dead-ended. In situations where there is no escape route for the air, it poses a serious risk of penetrating the skin and causing an air embolism. A potential remedy is to drill a hole to create an alternative escape route. However, this solution may introduce additional safety hazards, which will be discussed later. EXAIR’s air nozzles are engineered with fins that facilitate safe air escape, thereby preventing skin blockage. Consequently, users can operate the EXAIR Super Air Nozzles at pressures exceeding 30 PSIG with confidence.

The regulation 29CFR 1910.95(a) specifies the permissible sound levels for safe human exposure, emphasizing that extended exposure to elevated noise can result in irreversible hearing loss. However, the cross-drilled nozzle falls short in this regard, as it generates significant noise due to turbulent airflow, despite being suitable for dead-end pressure applications. In contrast, EXAIR’s nozzles are engineered to incorporate ambient air, resulting in a significantly quieter laminar flow. For example, the Model 1210 Safety Air Gun, equipped with the Model 1100 Nozzle, operates at a sound level of only 74dBA, which is comfortably below the noise exposure threshold for an eight-hour work shift.

If you have any inquiries about compressed air safety, or any EXAIR products, please feel free to contact us.

Jason Kirby
Application Engineer
Email: jasonkirby@exair.com
Twitter: @EXAIR_jk

Compressed Air Problems? Ask An Application Engineer If An EXAIR Super Air Nozzle Is Right For You.

Published on by Russ BowmanLeave a comment

A few years back, I had the pleasure of working with a machine shop manager who wanted to reduce the compressed air consumption in their facility. They had ten lathes, machining high-tech plastic products, and used crimped copper tubing to blow off chips and shavings as the parts were turned. They ran continuously — as did the air compressor — which occasionally caused header pressure to drop below the level required for operation of the pneumatic chucks & tool changers.

These cheap and easy blow offs were making things expensive and difficult for the company.

After some discussion and an Efficiency Lab test of one of their crimped tubes, I recommended our Model 1100 1/4 NPT Zinc Aluminum Super Air Nozzles. They’re our most popular engineered Air Nozzle for typical industrial blow-off applications. They generate a forceful, focused blast of air that’s ideal for chip removal on machine tools, and they’re ideally suited for a number of other uses as well. They bought ten (one for each machine) and installed them one afternoon, right before close of business, by cutting the crimps off the copper tubes and fitting them with simple compression fittings. The whole operation took about five minutes. When the machine shop manager arrived the next morning, he was at first alarmed because there was so little noise coming from the shop (he thought something was wrong with the machines) and then impressed when he found all the lathes were running, and the Super Air Nozzles were so much quieter than the crimped tubes.

The copper tube used to have a crimped end that was aimed at the part in the chuck. They simply cut it off and used a compression fitting to install the Super Air Nozzle.

While our Model 1100 Super Air Nozzle is our most popular one, EXAIR makes a wide range of engineered Air Nozzles to meet the needs of almost any blow-off application. If you’re replacing something else, we can test your current device(s) in our Efficiency Lab (like we did the crimped copper tubing here) and determine the Air Nozzle that most closely matches the performance required for your application.

If it’s a new application, we have tools at our disposal for proper product selection too:

  • The Catalog: Our Air Nozzles & Jets catalog section lists them all, from smallest to largest, with performance data, dimensions, and airflow patterns. I actually like to start with the airflow pattern: once we know the size & shape of the needed/desired flow, we can narrow down our selection.
  • Application Database: At last count, we had over 200 blow-off applications written up. Now, that includes Air Nozzles as well as Air Knives, Air Amplifiers, and Safety Air Guns (which have Air Nozzles on them), but keep in mind what I said about picking the size & shape of the airflow.
  • Engineering Assistance: If you’re short on time, find yourself completely stumped, or just want a 2nd opinion on the best product for your application, we’re here from 7am to 4pm Eastern Time to help you over the phone, in a Live Chat, or at an Engineering Consultation web meeting. You can also email techelp@exair.com, 24/7, with details about what you’re after.

At EXAIR, we want to help you get the most out of your compressed air use. If you want to find out more, give me a call.

Russ Bowman, CCASS

Application Engineer
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