air filtration competitors

High-efficiency particulate HEPA filtration can be used to filter particles down to only 0.3 microns, however infectious microorganisms can be less than 0.001 micron in size.  Because hospital codes call for high efficiency filters to be located downstream of the cooling coils, they become damp & collect contaminates

Mold spores are large enough to be caught in HEPA filters, but stay alive on the filter surface. Other particles accumulate in the filter & start acting as nutrients & allow mold spores to potentially grow on & through the filter membrane & eventually release new spores into the air. So frequent replacement of HEPA filters is critical since pathogens collected on the filter & are re-released into the air distribution system of a building

Green Pure Air systems are installed upstream, disinfecting cooling coils, duct systems & filters, distroying microorganisms in all devices

Unlike Green Pure Air, Ultraviolet Germicidal Irradiation Disinfection (UVGI) application is limited & has the following deficiencies;

• Only effective in limited applications, must have direct contact, distance effects the UV level, light travels only by line of sight
• Efficacy is species dependent & has reduced effect on more-resistant bacteria (MRSA) & fungi spores (Am J Infect Control 2010)
• Efficacy is significantly reduced >75% humidity - humidity tends to be high in air distribution systems (Am J Infect Control 2010)
• Efficacy is highly reliant on airflow, air mixing with microbes & has limited effect on infectious spores (Am J Infect Control 2010)
• UVGI units are located away from occupants, warm air rests high, UVGI has limited effect on the colder air below(Am J Infect Control 2010)
• UV irradiation is classified as a probable human carcinogen, effects eyes & skin & requires special care
• Not effective in Operating Rooms (OR) & ACH rooms, where air changes well above 4-6 ACH
• UVGI marketing claims on prevention of Hospital Associated Infection, not been substantiated by existing data (Am J Infect Control 2010)
• The biological agents that might be used in bioterrorism, such as anthrax, are not susceptible to UVGI (Am J Infect Control 2010)

Another adverse health effect of UVGI on humans is the form of erythema on shin of painful photokeratitis of eyes. There UVGI lights are kept in deep louver enclosures to prevent overexposure at eye level or excessive reflection from ceilings, but those cases absorb a big amount of the useful UV energy, making it less efficient (Am J Infect Control 2010)

UVGI systems only disinfect the outer areas of the cooling fins - as light only travels in a straight line

energy savings for buildings

A coil fouled with biological contaminates cannot supply proper heat transfer & results in greater energy consumption. Equipment operating with dirty coils can use up to 30% more energy than those with clean coils. Additionally, a dirty system’s cooling capacity can be reduced by as much as 30%. Dirty coils increase operating pressure and temperatures that breakdown the compressor’s lubricant and can result in equipment failure

There are many acid and alkaline based cleaners available to clean coils. These chemicals clean by creating a chemical reaction between the cleaner & the coil surface. This damages the coils by causing metal loss over time & carry with them an inherent danger to personnel & equipment. The remains of these chemicals are then distributed to the occupants of the building. Once cleaned, the cooling coils are again contaminated within a short period of time

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