Super Air Knife Math – When 72 + 72 = 75

The Super Air Knife is the latest generation of EXAIR engineered air knife that dramatically reduces compressed air usage and noise when compared to other blowoffs.

Super Air Knife Data

From the chart above, the Super Air Knife when supplied with 100 PSIG of compressed air has a sound level of just 72 dBA (A-weighted decibel scale) when measured from 3′ away.  72 dBA is a moderate sound level, and some common comparisons are ‘normal speaking voice’ at 70 dBA and ‘living room music’ at 76 dBA.

For many processes, such as a bottling line drying operation, a pair of the air knives delivers the best performance. When asked, “what is the sound level for (2) of the knives,” a little Acoustic Engineering is in order. Because the decibel scale is logarithmic, the result is not as simple as adding 72 + 72 = 144.  144 dBA is in the range of a jet aircraft take off! Thankfully, both the actual sound level and the numerical value are determined another way.  I’ll spare you a lot of the math but the equation is as below.

Capture

… where SL1, SL2, SL3 are the sound levels in dBA of the each sound makers, for as many that are being combined.

In the case of (2) Super Air Knives operated 100 PSIG, the combined sound works out to be a quiet 75.0 dBA — a powerful, efficient and quiet product ideal for many applications and process within the manufacturing environment.

Super Air Knife

Super Air Knife

As a helpful rule of thumb- combining any (2) items will yield an increase of 3 dBA, combining (3) results in a rise of 4.8 dBA, and combining (4) results in a 6 dBA rise over just (1) of the items.

The Super Air Knives have been successfully used in a wide range of applications, including part drying, sheet and conveyor cleaning, web cooling, scrap removal, pre-paint dust blowoff, and many, many more.

To discuss your application and how an EXAIR Intelligent Compressed Air Product can make your process better and quieter, 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

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Air Nozzles Blowoff Guide Available For FREE

Are you looking for an engineered Air Nozzle to replace your existing unsafe open pipe? Maybe you are wanting to reduce the sound level in your facility or decrease your energy costs? EXAIR offers a large variety of Air Nozzles that are ALL OSHA compliant to meet or exceed OSHA Standard 1910.242(b), by eliminating any potential for dead-ending the air flow out of the nozzle and keeping the outlet pressure safe. The design of our Super Air Nozzles ejects the compressed  air behind a series of fins so there is always path for the air to escape, meaning they cannot be dead ended.

OSHA Noise Level

ALL of EXAIR’s Air Nozzles meet or exceed noise exposure levels.

In addition, our air nozzles meet the OSHA Standard 29 CFR – 1910.95(a) for allowable noise exposure levels. Excessive noise in the workplace can cause stress, lack of concentration leading to accidents and potential long term hearing loss (More OSHA Noise Induced Hearing Loss info here). EXAIR’s air nozzles entrain surrounding ambient air up to 25 times for every 1 part of compressed air, producing much less wind shear, reducing the output sound level, while also making our units more efficient, consuming less compressed air.

 

air nozzle flow

How our Super Air Nozzles entrain surrounding air.

We offer nozzles from our smallest offering with a tiny M4 thread up to our largest 1-1/4 NPT unit, with varying force from 2 ounces up to 23 lbs., in zinc aluminum, stainless steel, brass or PEEK plastic.

With such a vast offering, we understand selection can seem difficult. To simplify the process we offer our Air Nozzles Blowoff Guide. Our FREE Blowoff Guide has all the information available in regards to force, dimensions, air flow patterns, air consumption and materials.You will also find detailed information about our full product line of Safety Air Guns as well.

blowoff guide

Order our complimentary Blowoff Guide today!

To order our complimentary blowoff guide, please click here. If you need additional information, please give us a call at 800-903-9247.

Justin Nicholl
Application Engineer
justinnicholl@exair.com
@EXAIR_JN

 

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