11.11.2014
You must have JavaScript enabled in your browser to utilize the functionality of this website. As with most cleaning agents, especially bleach and chlorine, Clorox Germicidal Bleach proves extremely dangerous and harmful when swallowed and may severely irritate skin, sinuses, and membranes if contacted or inhaled. Wear protective safety goggles and do not touch the face or eyes while using this germicidal bleach. If any article of clothing becomes contaminated remove the clothing promptly and wash skin thoroughly with water.
Ultraviolet (UV) light is one form of electromagnetic energy produced naturally by the sun. The entire UV spectrum can kill or inactivate many microorganism species, preventing them from replicating.
UVC exposure inactivates microbial organisms such as bacteria and viruses by altering the structure and the molecular bonds of their DNA (Deoxyribonucleic acid). DNA is a “blue print” these organisms use to develop, function and reproduce.
Ultraviolet germicidal lamps provide a much more powerful and concentrated effect of ultraviolet energy than can be found naturally.
The biofilms themselves give off prod­ucts of metabolism known as volatile organic compounds (VOCs) which may range in effects from watery eyes and head­aches, to more severe allergy and asthma responses. Numerous studies have demonstrated that the HVAC system is a viable amplifier, reservoir and disseminator of pathogenic and opportunistic bacteria, viruses and mold.
No matter how good the coil cleaner, sprayer or pressure washer used, the effectiveness of these methods reaches about 1 inch into the coil and the organic and biologically active matter gets packed deeper into the coil fins.
Installed on air effluent side of the condensate cooling coils and the drain pan, Steril-Aire UVC energy destroys surface biofilm and airborne microorganisms before they circulate throughout the HVAC system.
Numerous studies have demonstrated that the HVAC system is a viable reservoir of pathogenic and opportunistic bacteria and mold.
The quality of indoor air, influenced by the levels of bioaerosols, contaminants and pollutants, can affect occupant health and development, resulting in reduced productivity and increased absenteeism. Biological fouling of evaporator fin and tube heat exchangers is a key contributor to decreased HVAC capacity. Steril-Aire high output UVC provides continuous cleaning of coils, eliminating the biofilm that causes reductions in operational efficiency.
Read how Steril-Aire customers have improved system efficiency and achieved energy savings.
A 10,000 square foot building can produce more than 15,000 gallons of condensate water per year. Manual coil cleaning can be a major HVAC maintenance expense and may be very difficult to perform on small, tough-to-access packaged or unitary systems.
Steril-Aire UVC solves these problems by eliminating the need for chemical cleaning or pressure washing of any size coil. The surface cleaning effects of UVC helps restore older HVAC system to efficient operation and maintain new systems at factory design efficiency, while protecting system components against the acids that are emitted from the biofilm and the corrosive effects of chemical coil cleaning. The C wavelength of the UV spectrum targets the DNA of microorganisms, destroying their cells and making replication impossible.


By applying the power of UVC at the source of contamination – the HVAC evaporator coils and drain pan – Steril-Aire UVC destroys the reservoir of microorganisms. To keep coils clean and free of biofilm and other buildup, a high-output UVC-light source should be positioned perpendicular to the fins of the coil and 12 in.
Steril-Aire has developed a UVC Application Standard that includes technical data and specifications, as well as installation, sizing, dosage and other guidelines to assist in the proper selection and application techniques of UVC lamp systems. For large or critical applications, change out should be performed when Emitter output decreases by 40% as measured by a radiometer, after about 9,000 hours or 12 months. Dispose of them as you would any fluorescent tubes, in compliance with your country, local or state codes.
The fast contact time allows for quick turnover of a conference room or allows your kids to get playing in record time.
Allow at least five minutes of contact surface time in order for the solution to fully disinfect. Simply pour a cup of undiluted bleach into the offensive smelling drain and then flush the drain with hot water. Use rubber gloves to protect skin and opt for a safety mask if the vapors cause irritation. Medical conditions such as heart conditions or chronic respiratory problems may be agitated by the bleach vapors. If the bleach or bleach solution comes into contact with the eyes or face, immediately flush with water for 15 minutes and contact a medical professional. He has an over-productive olfactory system with absolutely zero tolerance for unpleasant aromas. By destroying the organism’s ability to reproduce, it becomes harmless since it cannot colonize. The list below identifies some of the many microorganisms that have been isolated from evaporator coils, drain pans, ducts, final filters and diffusers. The biofilms themselves give off products of metabolism known as volatile organic compounds (VOCs) which can trigger occupant complaints of watery eyes and headaches and even severe allergy and asthma responses. The biological fouling acts as an insulator, increasing air flow resistance and decreasing heat transfer.
Studies have shown that removal of a .024” layer of biofilm can reduce HVAC energy usage by 21% by restoring heat transfer and system efficiency. Manually cleaning only temporarily removes the contaminants and in most cases, simply pushes the biological contaminants further back into the fins. Directed at a cooling coil or drain pan, UVC energy destroys surface biofilm, a gluey matrix of microorganisms (bacteria, fungi, debris, et al.) that grows in the presence of moisture. This same solution may be used to remove mildew as well as any persistent stains.To sanitize surfaces add 1 tbsp to a gallon of water and use a cloth or sponge to wipe down surfaces with the solution. If utilizing this bleach to clean or decontaminate Clostridium difficile spores or other dangerous bacteria, be certain to wear appropriate gloves, goggles, and masks to protect from inhaling or ingesting the dangerous bacteria. Please take proper precautions to limit exposure if you suffer from affected health issues.


Bleach may discolor or degrade the fibers in fabrics, take precautions to limit contact to protect clothing.
The application of UVC energy to inactivate microorganisms is also known as Germicidal Irradiation or UVGI.
After UVC exposure, the organism dies off leaving no offspring, and the population of the microorganism diminishes rapidly. This gluey matrix growing on heating, ventilating and air conditioning (HVAC) evaporator coils, drain pans and ducts is, in fact, biofilm. The biological contaminants typically found on HVAC coils and drain pans have also been linked to Sick Building Syndrome (SBS) and hospital acquired infections.
The fans run longer to maintain the building at the desired temperature, increasing kW draw with reduced cooling tonnage capacity.
Reduced cooling coil pressure drop helps save fan energy, while improved cooling coil heat transfer efficiency. In order to effectively repurpose HVAC condensate, it must be free of biological components. Maintenance crews and building occupants are no longer exposed to harmful cleaning chemicals and disinfectants. Biofilm is prevalent in HVAC systems and leads to a host of indoor air quality (IAQ) and HVAC operational problems that are sometimes mistakenly attributed solely to mold. The recirculating air in HVAC systems creates redundancy in exposing microorganisms to UVC, ensuring multiple passes so the light energy is effective against large quantities of airborne microorganisms. Do not stare into the UV flashlight for prolonged time as it can damage your eyesight with direct exposure.
Use a 1:10 bleach to water dilution and saturate the compromised area for at least 10 minutes to fully decontaminate an area.
Biofilm is an active, complex microbial matrix of mold and bacteria that adheres to the fins of the coil and protects the organisms from biocides. Higher chilled water temperature setpoints allows the chiller plant to operate more efficiently. Using Steril-Aire’s patented installation methodology and high output UVC directed at the cooling coil and drain pan, the condensate is distilled and clean. Steril-Aire UVC delivers the highest UVC output, driving HVAC system efficiency while improving indoor air quality. Instead drink a full glass of water and contact a doctor or poison control center immediately. The chillers and pumps work harder to raise the leaving water temperature and achieve set temperature points.
The condensate can be effectively collected for use as cooling tower makeup water or for gray water uses.



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