Why Buy CaluTech Air Purifiers?

CaluTech guarantees their most popular germicidal air duct system for 10 years, and it has been manufactured to last 20. Furnace or just air conditioning, it works great. The owner of CaluTech has this very unit (CaluTech Blue) in his own home, originally designed, manufactured, and installed years ago to help his son suffering from asthma conditions. This little boy no longer uses inhalers and no longer receives daily breathing treatments from his nebulizer filled with albuterol syrup. He began breathing better within 48 hours, and so was born the CaluTech Blue and this company. Before that he spent a week in Oak Lawn, Illinois' Hope Hospital, the children's hospital next to Christ Hospital, just outside of Chicago. The owner's son could barely breathe on his own anymore and they tested him for Cystic Fibrosis and several other things before determining he needed hourly treatments on a nebulizer and prescription inhalers. Family & friends were impressed after learning how much this system helped him and the unit became known through a chain of others who started using it. Eventually the unit was mass produced and the company began making more units to satisfy different situations and installation requirements, all the way to the latest invention in January of 2005, the CaluTech Blueray super high output UV light air purifier system. A lot of people wanted our product but had no air ducts so we made something powerful that they could use, the Breathe Safe Air portable air purifier. Even the United Nations picked CaluTech after reviewing several of our competitors to supply their facility with UV air purifiers. We don't run infomercials with fake actors and crowds praising the product (like those ionic air purifiers with no real scientific evidence that they even help people), we don't even advertise anywhere outside of search engines, not even radio. It's all word of mouth and now the Internet. Our products move out the door faster then we can make them because they really work. Everything we use is bought from US companies only, and 100% of our manufacturing is also in the USA. We use real steel, not plastic, for durability. We use only UL Listed components for safety & reliability, and we conduct tests on an ongoing basis to ensure our product is the best, and it's built to last for years.

We offer several different types of UV air purifiers. The most popular is the CaluTech Blue™ --- a UV-C germicidal UV air purifier that utilizes ultraviolet technology and intense high powered UV lamps that fit the UV air purifier. This system is installed in the air duct of a heating - air conditioning system in your home or business. It plugs into any standard wall outlet and destroys pathogens in the air. It uses energy equivalent to a standard light bulb.

Not all UV lamps are created equally. There is a vast array of differences within lamps used for this type of application. A recent report by the Environmental Protection Agency, (EPA), rated the ultraviolet lamp as being superior in the use of air purification. See the Pennsylvania State University study for more information on ultraviolet air purifiers by clicking the UV Study button in the left menu. The CaluTech UV air purifier offers enough UVC light to kill most any common biological contaminant. We offer custom units as well. We have manufactured units using as many as 20 UV-C lamps, just email us for a quote, it's not as much as you might think. We don't mark-up and we don't overcharge.

Other air purifiers and air cleaner systems similar to ours are not nearly as effective. Don't fall for the imitations when it comes to air purification. This product is the real deal, and it utilizes dual high powered UV lamps. If the UV product you purchase doesn't say CaluTech, it's not a CaluTech, plain and simple.

CALUTECH is a Registered Trademark, listed with the United States Patent & Trademark office. This website is copyrighted and is protected worldwide under the Berne Convention and the International Copyright Convention. Using content from this website without license from CaluTech subjects you to legal liability. ALL text, including marketing reports & analysis, and text tables are protected by the U.S. Copyright Office.

Frequently Asked Questions

I already have a duct mounted UV air purifier, will these do more for me if I add it to what I have?

Even better! If you have one by a competitor you can trade it in and take up to 50% off, depending on the unit you have, no matter how old it is, for one of our air duct UV air purifiers! Just email us with what you have and we'll take care of you!

I saw a similar item, called an ozone generator. Is this the same thing?

The CaluTech products are not an ozone generating air cleaners. Ozone is harmful to your health.

How does your product compare to the ionic purifier on TV?

Simply put, to date, there is no known scientific evidence that ionic air purifiers actually help people in any way, just opinions, no proof. UV-C is proven. That's a good marketing department they have!

How long are UV lamps good for?

CaluTech products use UV-C germicidal lamps which operate at a wavelength of 253.7 nanometers. Each lamp is under warranty for 1 year. It is a very cost effective UV air purifier. The lamps are known to operate for as long as 3 years. We recommend annual changes of the UV lamps for maximum sterilization.

How much maintenance does the unit require?

CaluTech Blue air purifiers require minimal maintenance. All you need to do is change the lamps once a year for maximum efficiency. Once your unit is installed, you simply plug it in. Portable units need filter changes twice per year, and 2 years of filters are supplied with each unit.

Is this something the average homeowner can install themselves?

Yes. Installation is simple, but if you prefer you can contact your local heating and air conditioning company for installation or a handyman. The unit can be installed in as little as 20 minutes. If you do not wish to install a furnace duct mounted germicidal air purifier you should have a qualified contractor install it for you. Installation if very simple and only requires a drill with a 2" hole saw and a Phillips screwdriver, that's it! (hole saw can be 1 3/4, 1 7/8, 2, 2 1/4, or 2 1/2)

What kind of warranty does CaluTech offer?

The CaluTech Blue, Mini-Blue and DSL UV air purifiers carry a warranty of 10 years against parts and labor. The Airtronics UV purifier carries a 5 year warranty, and the Breathe Safe Air portable UV air purifier carries a 90 day warranty. We also offer replacement parts here.

I've seen other units available that claim to be high powered air purification utilizing UV. How does CaluTech's unit compare?

There is no comparison. The CaluTech Blue™ produces over 24,000 microwatts of complete air sterilization and has been tested to safely sanitize between 98 and 99.9 percent of the indoor air. No other unit we're aware of on the market can compete. The effect of irradiation is based on microwatts and time of exposure. The lethal exposure period of an organism is determined by its susceptibility. The wavelength of radiation, the density of the radiation flux (watts per unit area) and time exposure. These UV lamps are regulated at 253.7 nm energy. The germicidal effectiveness is proportional to the product of intensity time from one micro-second to a few hours. CaluTech estimated a typical air velocity of a home furnace and doubled the amount of UV actually needed.
Some references you can check:
Ultraviolet and Infrared engineering by Summer, Interscience Publishers
American conference of Governmental and industrial hygienist, Threshold limits for workroom air.
Ultra-Violet Radiation by Koller, Pub. John Wiley and sons.
Any state government agency should also have information on the technology used in the wastewater field which is much more critical than air sterilization. UV is commonly used in place of chlorine for disinfections and the technology has been used extensively in the pharmaceutical industry.

There are a lot of units on the market. Where does the CaluTech Blue™ fall into place?

Because of the recent scare of bio-terrorism, companies have virtually popped up overnight selling units that look a lot like the CaluTech Blue™ purification system. These are NOT CaluTech units and they do not perform to the level of CaluTech standards. Some claim 50 or 60 thousand microwatts with a short little single lamp, this is not true and we've reported this to the trade commission.

Is the CaluTech Blue™ constructed in a solid manner, and are the electrical components safe?

The CaluTech Blue™ is encased in a steel box and the electrical components are UL and/or CE, CSA Listed. All CaluTech inner components use only UL Listed parts.

How many watts? What are the details of the bulb?

UV-C: 24-26 Watts. Bulb: 36 watts each, Hot Cathode. This is the spec for the CaluTech Blue, DSL, Breathe Safe Air, and Airtronics UV air purifiers. The new High Output duct mounted UV air purifier, not yet on this website, features 120 watts. The new Mini-Blue furnace / A/C duct mount air purifier features 2 18w lamps with short lamps for tight areas.

Is Hot Cathode better than Cold Cathode?

In the uppermost vertical section of your plenum both hot and cold cathode tubes suffer diminished effectiveness based on cooler temperatures. We overcompensate with excessive UV-C wattage to get a maximum kill without ozone.

How much does all this cost?

Units on the market are similar in price, but usually much higher. The CaluTech Blue is fully guaranteed. Replacement lamps are available, (Two 36w UV Lamps are used on the Blue and DSL. One 36w UV Lamp is used on the Airtronics 1 Lamp model.), and should be replaced annually for maximum efficiency. 18w UV Lamps are available. (Two are used on the Mini-Blue) and 60w UV Lamps are available (Two are used on the High Output model).

I've had a CaluTech system in my home for over a year and have never changed the lamps. Does this mean it is no longer cleaning the air?

No. Although the lamps should be changed yearly for maximum efficiency, your unit is still cleaning the air. Not changing the lamps every year lowers the effectiveness of the sanitizing cycle.

I'd like to benefit from the use of a UV air cleaner, but I do not have forced air ducts in my home. Can I use the CaluTech Blue?

Unfortunately you cannot, it is for ventilation only but you can benefit from the CaluTech Breathe Safe Air, a new portable system that we created for people who do not have forced air ventilation.

I've just received my furnace duct mount UV air purifier. The instructions explain everything well, but I'm still not sure where to put it.

If you have A/C we recommend installation above the coils. If you do not know where they are look for a drain hose or copper lines entering your air duct. This is where the coil is. You want to install the unit above this coil. Because coils are always wet, even when the A/C is not running, it becomes a breeding ground for bacteria, viruses, dust mites, and mold. The UV light shining down on this coil burns all of these pathogens up. DO NOT drill right into the duct where the drain or copper lines are coming out. You must install it above the coil. If you run a drill bit into this coil all the freon will come out and you will need an HVAC contractor to open the duct and repair the coil, or even replace it. A good idea is to drill a small inspection hole above where the coil is, or even open the air duct to look at where it sits, so you know you've installed it in the right spot. If you do not have A/C you can install the unit easily in the cold air return line, which is the duct that brings the air in the home or building to the furnace so it can be heated. If you're in doubt, call a heating & air conditioning company to install it for you. It doesn't cost much to have it professionally installed. Install time is usually less than 20 minutes.

I have a humidifier on my supply duct. Can I install the UV air purifier near the humidifier?

Yes, but only above the humidifier. If you install it below the humidifier water droplets can drip down on the lamps and shorten their life.

My HVAC contractor cut the cord off the CaluTech duct mounted air purifier and wired it direct to the fan. Does this mean I have no warranty now?

No, this does not void your warranty, but you would have been better off with the unit on always, not connected to a relay or switch on the fan. When the fan isn't running the pathogens and mold spores in the air don't stop too. In addition, the dust mites don't stop mating and multiplying. You want the UV on whenever possible. If mounted at the coils keep in mind that they are always wet, even when the fan shuts off. If the UV goes off at the coil for even 10 minutes mold already begins to form. Keep it on for cleaner air. This extends the lamp life and the electrical cost is no more than a single light bulb.

If I have a problem with one of your duct mounted air purifiers how do I get my replacement?

That's easy. No return authorization needed, just send it back to us and we'll send you the replacement immediately. Be sure to include the name and zip code inside the box that you used when you purchased so we can locate your information (unless your unit has a warranty serial number tag on it. If it does we scan the bar code and know who you are).

On the CaluTech Blue you offer a 10 year warranty. If my unit fails in 9 years and you give me my replacement unit do I get another 10 year warranty on the replacement or does my warranty expire?

Yes, you get another 10 years on the replacement, from date of the shipping of the new unit. The same applies to UV lamps. If they fail during the warranty period of 1 year we will send you a new lamp, or lamps, and extend your warranty for another year.

What exactly is ultraviolet light?

Ultraviolet light is an invisible light (to humans) but many insects can see it (known as phototactic eye sight). UV light emits at different levels called nanometers (a unit of measurement that is one billionth of a meter). Ultraviolet light is separated into three common spectrums. UVA operates between 315 and 400 nanometers (nm). These are known as black lights and many insect zappers use this UV lamp to attract insects to the zapper because the insects think the light they see is the sun. UVB is used for tanning beds and operates between 280 and 315 nm. UVC is used for UVGI (ultraviolet germicidal irradiation) and this is what our units operate at. This light has a wavelength of 100 to 280 nm. Our products operate at 253.7 nm which is the optimal level of UVC light for sterilization of the air, and even water. UV light is present in a fluorescent lamp tube which contains a mixture of 3 mgs of mercury and a phosphor coating. When UV lamps are energized the electrical current is mixed through the lamp tube that contains the phosphor and mercury vapor. The atoms in the Mercury absorb the energy from the electrical current which causes the atoms to become unstable. The atoms seek to become stable again so in order to do this they must lose any extra energy they contain. When the atoms release this energy it is released in the form of ultraviolet radiation. When the UV radiation is present in the tube lamps it attempts to get out of the phosphor coated lamps (coated inside the tubes). When this happens UV light is released. The more or less amount of phosphor coating inside the lamp tubes the higher or lower the amount of nanometers. With different mixes of phosphor the desired amount of UV is produced (A, B, or C). Our UVC light penetrates the outer membrane of viruses, bacteria, mold, and even yeasts. When this happens the DNA of the microbes is modified, which causes modifications to the DNA structure, and eliminates the possibility of these microbes to reproduce, so they eventually all die off just as humans would if we could no longer produce. All microorganisms have different levels of tolerance to radiation and these levels are measured (known as a D Value) which makes it possible to estimate the time of exposure required to destroy these different microorganisms. The chart on our home page shows many of these values and where possible we also link to more information about the virus, mold, bacteria, yeast, etc.

Testimonials

"It has been over a month since we purchased our CaluTech Blue Air UV air purifier from CaluTech. We are very satisfied with it. So far our skin allergies have been reduced significantly. My wife has suffered from A-topic dermatitis on her hands for over two years. Topical ointments and pregnisone (not prednisone) were a large part of her life. Now with the new CaluTech Blue Air UV air purifier she hasn't had to take anything for nearly a month. We are in the middle of flu, cold and stomach bug season. Typically when one child would get sick they would all get sick. Now with our new CaluTech air purifier we have experienced less sickness. This has been one of the best investments we have made in our 11 years of marriage.
Thank you, thank you, thank you!"
Rich & Barb

"Dear Calutech company, I installed your uv air purifier after seeing uv on tv and I have to say, it's impressive. My little boy has suffered from severe asthmatic conditions since he was born. He is 6 years old, and I'm happy to say he's breathing better. You've done more for my son than doctors have for the past 5 years. After 6 days hospitalization at 7 months old, after nebulizer treatments every hour at home, after vacerinil inhalers, after lots of prescriptions like Albuterol syrup and steroid syrup, my son can sleep without coughing all night. You guys should be on Oprah.
My many thanks to you for an excellent product. If you ever need a referral, you have my full permission to use my endorsement. I've never felt so solid about a product before. This is true American machinery!"
Ashley Henderson

"I am a banker and not a mechanic, carpenter or electrician. The installation of the UV purification system took me about 10 minutes. Very straight forward instructions, and the supplied template and drilling bits made the installation a "no-brainer", even for a novice like me. I had to run romex wire to a plug and that took about another 10 minutes. I woke up this morning (5:30am-Central time...check the time on this email for proof) feeling charged and rested with my sinuses clear and no congestion for the first time in months. I have had recurring sinus infections which have cause me to take continuing antibiotics. With these apparent results overnight, the unit should pay for itself with the reduction of Doctor Bills and prescriptions in a matter of months! You may use my emails as testimonials, because it is truth."
Guy

"Just got home with our newborn boy (the main reason for purchasing your product) and was happy to see that the CaluTech Blue was on my door step, but the really surprising thing was that you also included the drill bits required for completing the installation. After just having a new child I would not have really had enough time to get the tools together and get it installed so quickly. It is not very often that a customer gets Everything they need without asking for it.
Thanks for making my purchase even easier.
Looking forward to a healthier home and family."
Ed

"I purchased your unit. I received it today...this thing is a little honey. Last year was my worst year for allergies and it started early and is still going. I was afraid I was going to become a bubble boy. I took every prescription allergy med my specialist prescribed. I even bought on of your CaluTech Blue UV systems. It helped a lot. Then last December I bought one of your small wall units. I could not believe the difference it made in our guest bathroom. After an hour it was almost unbearable, the 03 this little jewel produced. Everybody I know could use one of these units. The best customer you could have"
Jim

"Just want to let you know you have a wonderful product. I ordered another one for my other unit. I love it. I hope it works for our better health."
Theodore

"First things first - Happy Turkey Day Calutech! - We have received our Calutech Blue air purifier and installed it last night. What in the world is this thing doing? We feel fantastic today, is this coincidence? I'm a heavy smoker and so is the wife so we always snore snore snore and wake up every morning with this weird drip in our throats, hard to explain unless you smoke a lot. Anyway, today we wake up and both of us, almost at the same time, looked at each other and said "hey, I can breathe easier". We both noticed a change in the air and we both felt very rested this morning. This is really weird, I've never heard of such a product that changes your feelings. Is this possible or am I just going crazy?."
Tom & Brenda

"The CaluTech Blue is a very nice air purifier. We would like to order another one." Coral Surgery Center, Miami, Florida

"Hi and thanks, The shipment arrived Wednesday and everything was packed well. Thank you for the shipment notifications. The Calutech Blue installs easily. Your directions were very good and simple, and the unit is A very solid piece of equipment."
Robert

"We bought the Calutech Blue to install in a customer's home. This woman has had bad allergies and nasal problems for a long time. She told us the next morning her sinuses were clear. I couldn't believe it worked that fast. You can depend on us buying a lot more Calutech Blue air purifiers."
Burke Mechanical, Delmar, New York

"The Calutech Blue is a really great product. I told all my friends and have 5 more customers for you."
Havis

"We installed the CaluTech Blue last weekend, and I have to tell you that I myself have not had any sinus problems since. I'm always congested, have been for years, but not anymore. Thank you!" Hawthorne Press, Spring Grove, Illinois

"Dear Calutech,
My Daughter suffered constant allergy symptoms since birth. My wife, son and I suffered flu like symptoms - ear & nose infections, sore throats, and headaches year round. Not until the beginning of this year, May 2004, did we realize the cause of our health problems. For the last 14 years, rain had been seeping into the walls of my Daughter's room. This year strong winds and heavy rains caused roof leakage and rain damage into the attic and walls of the house. We had major black mold present making the house inhabitable. Upon learning of Calutech, we contacted you for a CaluTech Blue Air UV air purifier, notifying you of our extreme situation. The Calutech Blue arrived, installation that evening was made easy by the template and to my amazement even drill bits were supplied. By the next day, we were able to occupy the house without any of the symptoms we previously had suffered. Renovations were undertaken to rid the house of the mold, and the Calutech Blue continues to provide a healthy environment. ALL health officials, and heating/cooling companies should be made aware of Calutech and its Air UV purifiers. A proactive approach would eliminate needless suffering by many people. Our deepest gratitude to Calutech,"
M.

"I love the unit. Easy to install and looks very well made."
J.

"Installation (CaluTech Blue) was a piece of cake & took only 15 minutes."
Frank

"Hello guys. I wanted to give you an update on the Hurricane as you requested. There are a number of things I have noticed since turning it on and running it for 24 hours on high and since then on high during the day and lower at night. But first, our home is about 2700 square feet and is 2 story. So, to run it on high I pull it into the foyer so that it has access to upstairs. The first thing I noticed is that it removes any odors within a couple of hours -- from food that has been cooked, etc. That really amazed me. After a week, I noticed that my asthma had improved to the point that I no longer needed my inhaler in the house. I have 3 meds for asthma -- the inhaler, a powder that is in a discus, and a pill. I have stopped taking the pill and have only used the powder and inhaler a couple of times this week. That in itself is amazing because we are in the worst allergy/asthma part of the year aside from the spring. In addition, the care you guys give to your customers is top notch. I cannot use enough superlatives to describe how attentive you are to us. Somehow those who are considering one of your systems should know this. There truly are no more honest or trustworthy people out there than you. I appreciate that as much as the machine. Needless to say, I am quite impressed! Feel free to use any of this you would like to. I love this machine and already see great benefits."
Gordon

"Your (CaluTech) Blue UV air purifier is built like a tank. I'm glad to see something manufactured like it's 1950, all that tough U.S. Steel. Very nice!"
Hank

"I installed it (CaluTech Blue) yesterday with no problems at all, I was very impressed with the packaging first of all, I was concerned about the bulbs in the mail but they were so well protected it would have taken a hell of a lot to damage them in transit. I was also impressed with the overall quality of the base unit, heavy, well constructed. I did a lot of comparing and yours has the best warranty I found, the brightest lamps single and combined by far, and the cost for replacement bulbs is very reasonable compared to others. I don't know if it is just coincidence but ever since we closed up the house at night my son who has allergies has been stuffed up and I usually wake with a headache here and there. Well letting the fan run on circulation all day I noticed last night my son didn't need his nose spray for the first time in a long time, and I woke with no stuffed nose. I have no complaints and am pleased with the primary results after 1 day.... that thanks for a great product."
Bill

"Just wanted to give you a brief update. One will be medical proof and the other does not reach that standard but still true. Yesterday I had my monthly doctor's visit and for the first time since December of 2001, I was not wheezing! Even with the medications I had been wheezing . . . now I only take one (instead of 3-4) for asthma and no wheezing. The only difference is using the Hurricane for a full month. It is still the height of allergy/asthma season in the Houston area. The doctor was quite impressed! The 2nd thing -- not provable -- is that last weekend our senior in college daughter came home with the flu . . . and soon on her heels our teacher daughter came home with a stomach virus (she lives on her own). In the past, I would have contracted one of these illnesses -- my immune system is shot -- but did not get either! I did not even turn the Hurricane up to high power -- just let it run on low the entire time. So, I am incredibly impressed! Not just with the machine but with you guys! I still encourage you to place your own story on your site. Knowing how and why you built the Hurricane speaks loudly about who you are and the kind of system you manufacture."
Gordon

"What a difference in the air!! This is a product everyone should own!."

"Hi, I wanted to send you an email real quick to express my amazement. In September I installed a Blue UV air purifier for a lady who bought from you. I am an HVAC contractor in Texas. The woman asked us to put in this light unit and we actually suggested it was a joke, that there's no way UV light will clean the air or do anything. How wrong I was! Two weeks after the install we came back to check a burning smell the woman reported and thought it was your unit. Ends up one of the air filters we installed ripped and fell onto the hot side of the burners. Anyway, while we were inspecting I noticed the coil condensers were shiny like new, where just a couple weeks ago they were full of sludge & mold. Even the air ducts looked clean, I actually asked her if she had them cleaned but she didn't. I am quite impressed and would be interested in becoming a distributor of your products, plus I'm ordering one for myself after I send this email. Technology is amazing these days!"
Steve

"I am a healthcare inspector/architect and I have recommended your unit (CaluTech Blue) to many friends and clients here in south Florida...mold is a big problem down here as you might know."
Richard

"I purchased an Oreck air purifier two weeks ago and it didn't work like they said it would, and then I found out my daughter in law bought your CaluTech Blue. When I walked into the house I noticed right away that something was different, I could just tell the air was not the same. My son has Asthma and he said he has been much better since they put in your air purifier. I would like one for my home too!"
Alicia

"It (CaluTech Blue) was a very easy product to install. The instructions were very clear. I had it in 15 min. The kit was also very well packaged. I was a little concerned when it came via UPS, since they feel every package is a basketball, but it was well protected on the inside. I have a large dog, so my house has always smelled like dog when I got home. The following day, when I got home, I did not notice the smell (and it was raining to). So it appears to be working well. I was surprised to see the 10 year warranty. If I was you, I would have no doubt about carrying the product."
Tim

"I had horrible sinus infections but as soon as I installed the CaluTech UV air purifier in my air duct they were gone. My grandkids even said they sleep better at my house then they do at home (since your unit was installed!)."
Mike

"I received the unit (CaluTech Blue) a couple of weeks ago, and I am sold on it."
Joseph

"It (CaluTech Blue) works fine and the air quality is super. We'll likely put one of these in our Phoenix house as well later in the year."
Gerry

"If anybody believes in the CaluTech Blue I do! It did a fantastic job with the humidity in my A/C. My coil looks like it just came out of the factory. The unit took out all the musty odor. Showed my doctor, he has air machines all over his office. My son in law has one too. They have two kids. It cleaned theirs up quite a bit and helped them a lot health wise."
William

"I received my CaluTech Blue. Haven't installed it yet but I'm impressed with it already."
Robert

"We installed the CaluTech Mini-Blue in our home about a week ago (2,300 Sq. Ft.). The musty odor in our crawl space is gone. The odors in the house are gone. My wife loves it. We cooked steak & onions, the odor was gone in minutes. My wife says the air in our house is like the air outside, very fresh. I'm impressed with your UV air purifier. I'd like to order a CaluTech Blue for my daughter in Chicago."

"I installed the new DSL furnace air purifier last week & I was impressed by the package. You provide simple instructions & I was able to install the unit in less than an hour. I caught an ad on TV last night for a new car that is including a UV purifier in the interior air filtration system. It appears the benefits of UV air treatment is catching on. I have already talked to the people at my favorite hardware store, plumbing & heating company, and local gas company (that sells & installs furnaces & air-conditioning) and passed on your web address so they can look into providing your product locally."
Kevin

Here is a great article on the US EPA website: Ozone Generators that are Sold as Air Cleaners: An Assessment of Effectiveness and Health Consequences