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Founded in 1963, MK Plastics is a global leader in the production of corrosion resistant industrial and commercial blowers, fans, and ventilation systems. Patented in several countries, our products are AMCA Certified for Air and Sound Performance.
We offer the broadest and most complete line of quality industrial and commercial corrosion-resistant fans and blowers. Our innovative ventilation technologies are patented in several countries.

Why Induced Flow/High Plume Fans Should Bear the AMCA Certified Rating Seal

Artist Name - MKPlastics-B004-016 - Why Induced Flow High Plume Fans Should Bear the AMCA Certified Rating Seal.mp3


AMCA Standard 260 (published in 2013) is the laboratory method of testing induced flow fans. This test standard defines the appropriate fashion in which any manufacturer can test induced flow fans within an accredited test facility.

Induced flow fans are somewhat of an anomaly in the fan business because at a given speed, power, and air density, they accelerate X amount of volume at the inlet of the fan but discharge something greater than X, at a higher velocity.The purpose of using this type of fan is to increase the airstream, mass flow and velocity (which is momentum), thereby generating a very tall, stable, and predictable plume column of air to exhaust effluent from a space.

With this method of testing, the fan is essentially tested two times in two different fashions in the AMCA accredited facility. The first test defines the performance of the fan on the inlet side. Next, the fan is turned over on its side and repositioned on the testing chamber. It's started again and the fan performance on the discharge side is tested.

From these two tests, the manufacturer of the induced flow/high plume fans will develop performance ratings, which are typically published in the public domain. Engineers typically receive these ratings in the form of a printed catalog or electronic fan selection package.

When the manufacturer produces a fan performance catalog, they have the option to submit the laboratory test results and catalog performance to AMCA for third party verification/validation, which demonstrates that the catalog performance data is an accurate reflection of the laboratory performance test data. Then, AMCA can license the manufacturer to certify the ratings so that the AMCA Certified rating seal can be applied to the product.

Why is the AMCA Seal Important?

The bottom line is, these fans are used in life saving applications. The performance of both the inlet side and discharge side of the fan have life safety impacts. On the inlet side, the fan needs to perform as the manufacturer claims so that the system will develop the necessary flows and pressures to maintain a safe environment within the facility.

On the discharge side of the fan, the product needs to perform accurately as the manufacturer has claimed because the effluent that is expelled must be jettisoned far enough from the building to keep it away from workers on the roof and/or reentrainment into air conditioning units on the building or the neighboring buildings.

The interesting aspect is that during commissioning, the test and air balance contractors stop doing their testing of the system at about the inlet side of the fans on the roof. In other words, nobody ever tests what happens on the discharge side of these fans. This becomes particularly interesting if additional monies have been spent for wind dispersion analysis on the building.

The performance on the discharge side of the fan, including the related safety and accuracy of wind dispersion analysis rests solely on the manufacturer's claim. Therefore, AMCA Certified induced flow fan performance gives credibility to the engineers' design. All M.K Plastics Axijet® Induced Flow Fans are licensed to bear the AMCA Certified rating seal for induced flow fan air and sound performance. To learn more about the AMCA Certified ventilation systems best suited for your application, contact us today.


MKPlastics004-016 Transcription

Shayla: Thank you for joining us today for the MK Plastics Podcast. I'm talking today with Vice President of US Sales and Marketing, Keith Lins, and Keith, today I want to know, why should induced flow or high plume be licensed to bear the AMCA certified rating seal?

Keith: Well, induced flow or high plume type fans should be licensed to bear the AMCA rating seal for air and sound performance for the following very important reason. First of all, AMCA standard 260 is our reference point here and AMCA standard 260 2013 is the laboratory method of testing induced flow fans for rating. What happens with this test standard is it defines the appropriate fashion in which any manufacturer in an AMCA accredited test facility can test induced flow fans and induced flow fans are somewhat of an anomaly in the fan business because at a given speed, power, and air density, these fans accelerate X amount of volume at the inlet of the fan but discharge something greater than X at a higher rate of velocity and the intent of using these fans is to increase the airstream, mass flow and velocity, which is momentum, thereby generating a very tall, stable, and predictable plume column of air to exhaust effluent from a space. Now that said, in this method of test, essentially what happens is the fan is tested two different times in two different fashions. It is done in an AMCA accredited facility and the first test defines the performance of the fan on the inlet side. Then, the fan is literally turned over on its side and repositioned on the testing chamber and started again and the fan performance on the discharge side of the fan is tested. So from these tests, the manufacturer of induced flow or high plume fans will develop performance ratings and these performance ratings are typically published in the public domain to engineers in the form of a catalog which can be printed or an electronic fan selection package. Now, when the manufacturer produces a fan performance catalog, they have the option to submit the laboratory test results and the catalog performance to AMCA for third party verification and validation that the catalog performance data is an accurate reflection of the laboratory performance test data. And then, AMCA can license the manufacturer to certify the ratings and the manufacturer can apply the AMCA certified rating seal. Now, why is this important? These fans are used in life saving applications and the performance of both the inlet side of the fan and the discharge side of the fan have life safety impact. On the inlet side, the fan needs to perform as the manufacturer claims so that the system will develop the necessary flows and pressures to keep a safe environment within the facility. On the discharge side of the fan, the fan needs to perform accurately as the manufacturer has claimed because the effluent that's being expelled from the building needs to be jettisoned away from the building to keep it away from workers on the roof and/or reentrainment into air conditioning units on the building or the neighbors' buildings. But the interesting fact of the matter is that during commissioning, the test and air balance contractors stop doing their testing of the system about at the inlet side of the fans on the roof. In other words, nobody ever tests what happens on the discharge side of these fans. Now this becomes particularly interesting if additional monies have been spent for wind dispersion analysis on the building and the performance on the discharge side of the fan, the safety relativity of that and the accuracy of the wind dispersion analysis rests solely on the manufacturer's claim of the performance of that product's discharge side because nobody ever test it. So AMCA certified induced flow fan performance gives credibility to the engineers' design and all MK Plastics Axijet induced flow fans are licensed to bear the AMCA certified rating seal for induced flow fan air and sound performance.

Shayla: As you can hear, this is a very important topic and if you have any questions beyond what Keith has talked about today, you can reach out to MK Plastics at 888-278-9988.

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