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UVC (Ultraviolet-C) air purifiers utilize ultraviolet light to reduce the SARS-CoV-2 virus, responsible for COVID-19, and other airborne pathogens like viruses, bacteria, or other microorganisms. UVC lamps can also destruct the fungi like mold, mildew, yeast, and other harmful airborne contaminants. Some UV air purifier models can reduce VOCs and remove other odors. UV air purifiers are an effective option for people with respiratory problems as they greatly reduce allergy and asthma triggers. Studies have shown that UVC lamps reduce fungal contamination within air-handling units.

Harmful or poor indoor air quality is comprised of air pollutants like particulates, germs and gases. Air filtration can mainly deal with particulates in air by reducing particulate down to a specific size, like HEPA rated particulate arresters, or down to a percentage of a range of sizes as a MERV rated air cleaner does. On the other hand, air purifiers can mainly deal with air pollutants like germs and gases, that are too small for a HEPA or MERV rated air cleaners to trap. Germs passing by a UVC lamp will be reduced. Gases passing by a UVC lamp will be broken down through an oxidation process that occurs when the UVC lamp shines on the PCO module of the air purifier.

The only maintenance required for a UV air purifier is the lamp replacement according to designated lamp life. Second Wind lamps are designed with a proprietary ceramic end cap, to attach the lamp to the air purifier frame. The ceramic end cap is a part of the lamp assembly and is not available separately. Do not be fooled by less expensive knock-off lamps advertised on the internet that may be a lamp without ceramic attachment.

Most of the Second Wind UV air purifier models have an ozone-free lamp that operates at a sole wavelength of 254 nm. The ozone-free lamps with 254 nm wavelength produce a strong germicidal effect and destruct the ozone. Few of the Second Wind UV air purifier models have an optional ozone generating lamp that operates at a dual-wavelength of 254 nm and 185 nm. The ozone lamps with dual-wavelength are required for some specific applications to oxidize organic compounds.

UV light can be harmful when someone is exposed for a long time. One should neither look at nor touch a UVC lamp while it is on for any length of time. When the UV air purifier is properly installed in your HVAC system by a professional contractor, there is no direct or harmful exposure of UV light to you or your family. Remember to power off your air purifier before replacing the lamps and do not look directly at a lamp that is powered on.

Photocatalytic Oxidation (PCO) is an effective way to reduce many types of airborne bacteria, chemical contaminants, and odors. PCO is achieved when UV rays are focused on titanium dioxide (TiO2) filter. This process creates hydroxyl radicals and super-oxide ions, which are highly reactive electrons. Finally, the chemical reaction takes place between the super-charged ion and the pollutant, effectively oxidizing (or burning) the pollutant. This breaks the pollutant down into harmless carbon dioxide and water molecules, purifying the air

UVC lights significantly reduce the number of germs in ductwork and other airspaces in your home. The 1903 Nobel Prize for Medicine was awarded to Niels Finsen for his use of UV against lupus vulgaris, tuberculosis of the skin. Today, UVC light is used to treat drinking water, wastewater, and indoor air.

Even though the entire UV spectrum is capable of reducing germs, the UVC energy with a wavelength of 100 to 280 nm provides the most germicidal effect with 265 nm being the optimum wavelength for damaging the DNA and RNA of the germs. Second Wind UVC lamps operate at a near-optimal wavelength of 253.7 nm and distribute a strong germicidal effect to reduce the germs that pass through the UV air purifiers.

ASHRAE recommended a minimum UVC dose value of 1,500 µJ/cm² for 99% reduction of SARS-CoV-2 in air. The virus passing through the Second Wind UVC system will undertake the recommended UVC dosage within a few seconds.

Read the ASHRAE Technical Resources on UVC dosage for Coronavirus

UV air purifiers are intended to run continuously. UVC lamps are effective against mold growth that occurs even if your blower in the HVAC system is off. Also, the repeated on and off would shorten the life of the UVC lamp.

YES! Replacing a lamp before it really “burns out” may appear lavish but not when it comes to UVC lamps. There is a decrease in the germicidal effectiveness of UVC lamps against their burning time. Hence, the UVC lamp should be replaced according to the designated lamp life mentioned in the installation manual. For people with respiratory illness, we strongly recommend an annual UVC lamp replacement for inhaling the purest air.

Second Wind UV air purifiers are sold and installed by licensed HVAC contractors. All the contractors can buy our products through their local wholesaler. We can be reached for advice at

Maintenance on the UV air purifiers should be performed by trained HVAC service technicians as accidental exposure to UV light is dangerous to the skin and eyes. The replacement lamp for Second Wind UV air purifier can be purchased from a licensed HVAC contractor or a local wholesaler.

Our residential UV air purifiers like the 2000 series, 2414 series, and Zephyr series have a product warranty ranging from 5-years to lifetime and a lamp warranty of 1-year from the date of purchase. Our commercial UV air purifiers like the NEMA series and 5000 series have a product warranty of 3-years and a lamp warranty of 1-year from the date of purchase. Any defective or damaged parts under the warranty period will be repaired or replaced. Homeowners are encouraged to carefully read the instructions on the installation manual before making any warranty claim.