You always hear about the eternal optimist that says you can always turn a negative into a positive if you just rethink the problem. All too often we have something happen in our lives that creates a negative feeling or puts us in a negative mood. But these negative thoughts are a waste of energy. Instead of dwelling on what could go wrong or did go wrong, look at all the positive things in you life and don’t waste energy worrying about the negative aspects of the issue.
The title of this blog relates to turning two negatives into a positive and while your life maybe filled with multiple negative thoughts the two negatives I am referring to relate to negative pressure of the physics kind.
Pure Air Systems has been making HEPA and Carbon based, fan powered, commercial grade air filtration systems since 1985. The use of certified, commercial grade HEPA filters creates a design issue in how you incorporate the motor/blower assembly and HEPA filter to obtain maximum performance with minimal noise and air turbulence.
HEPA filters, by their nature, have a relatively high resistance to air flow due to the extremely dense HEPA paper that is used in the fabrication of the filter. When moving air through a fan/motor assembly with a HEPA filter in line you have two options. You can put the fan in front of the HEPA and blow air through the HEPA filter keeping the fan/motor assembly in the dirty air stream or place the HEPA in front of the fan/motor assembly.
Since the resistance to moving air across the HEPA is so high ( over 1.0 inches as measured in water column) pushing the air through the HEPA filter creates an air buffeting affect and requires more horsepower to push the air through the filter. By placing the fan/motor assembly on the clean air side or “negative” side of the HEPA you get a very smooth flow of air, little or no buffeting and a reduction in horsepower requirements.
The HEPA systems manufactured by Pure Air Systems also incorporate a carbon media filter and a polyester, dual layer ring panel roughing filter. All of these filters are placed ahead of the fan/motor assembly. So they are all on the negative side of the blower and offer the same benefit of having a smooth, non-buffeting air flow across their surface areas and keep the blower and motor clean. So in essence, you are turning three negatives into a positive.
Many other companies that utilize HEPA filters in their systems place their blower/motor assembly ahead of the HEPA and this creates more noise fills up the HEPA filter faster as it tends to push the dirt into the HEPA paper rather than pull the dirt through, which is a more efficient way of using the HEPA filter.
For more information on this aspect of the HEPA systems made by Pure Air Systems please go to our website at: www.pureairsystems.com
About the Author: Don Musilli
My name is Don Musilli. I started Pure Air Systems in 1985 and then sold it in 2006. I continue to consult for PAS and write their blog and control their Twitter account. I also, on occasion, make changes to the website. The company is now almost 26 years old and has been a major player in offering commercial grade, high performance HEPA and Carbon based filtration systems for the commercial, institutional, industrial and residential markets.
I currently reside in Englewood, Florida where I write blogs and do social media marketing for a number of clients.
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