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What To Look For in a Whole-house Ultraviolet "In-Duct" Air Purifier.

The Original Air Probe Sanitizer residential and commercial air purifier system

Are you shopping for a UV-C germicidal air purification system that works?


Here are 18 Essential Things To Look For In a UV Central Air Purifier or Ultraviolet Air Disinfection System.


Ultraviolet-C light rays are extremely effective as an air purifier.
  • But it must be the right kind of UV-C.
  • And it must be properly selected and installed in the proper location in your central air conditioner or furnace.

The superior Original Air Probe Sanitizer™ UV-C system does it all. We guarantee it.


1. It must kill bacteria, viruses, mold, and mildew



Everywhere: in the air handler, ducts, and the rooms.


2. It must freshen the air and eliminate odors


An ordinary "in-duct" system can do neither.
Even strong chemical odors, for people with multiple chemical sensitivities (multiple chemical intolerance, MCS or MCI). In some cases, more than two 8" lamps are required to effectively remove odors or smoke. If you are purchasing the Air Probe Sanitizer to remove odors, our staff will be happy to help you select the proper unit.



3. The UV-C wavelength specification.


Because all UV-C lamps are NOT equal.


All Ultraviolet-C "light" is NOT the same. "UV-C" actually defines a very broad spectrum; only a narrow band of wavelengths in the UV-C spectrum are actually useful to clean the air, kill viruses, bacteria, etc. The Air Probe Sanitizer's UV-C lamps are unequalled.

Click here to see for yourself that these UV-C lamps are superior.

Most wavelengths in the ultraviolet spectrum do absolutely nothing to purify the air or kill germs. Other wavelengths produce ozone. Still ther wavelengths could cause permanent eye damage if, for example, a child stares at it for only a few seconds (when improperly installed).



4. The lamp's UV-C output power at the important light wavelength of 253.7 nm.


The ultraviolet rays from the lamps must be powerful enough to eliminate odors and freshen the air, as well as kill germs, viruses, bacteria, mold, and mildew. Compare the Original Air Probe Sanitizer™ to others.



5. Should not produce any ozone


While ozone in some other applications is not always a bad thing, you do not want ozone-producing UV in this application because:

  1. It cannot be adjusted or shut off. Once the pollution and odors are destroyed, you will smell ozone, and it must then be adjusted down or even turned off.
  2. Ozone in the presence of germicidal UV-C rays would corrode your cooling system, and separate the aluminum fins from the copper lines in the air conditioner cooling coil.
  3. Much of the ozone is destroyed by the UV-C rays anyway.
  4. Besides, you don't need ozone to do the job! Hydroxyl ions produced by the UV light do the job.



6. Its mounting location in your system.

NOT just an "in-duct" unit! It must be designed to be easily and properly installed very near the COLD AIR (supply) side of your central air conditioner's evaporator (cooling) coil and drain pan.

Dual-probe Air Probe Sanitizer (tm) central air purifier and sterilizer


The UV probes must be mounted next to the evaporator (cooling) coil, AND on the cold air side of the coil. The UV rays must shine both on the cooling coil and on the water drain pan underneath the coil, because this is the area where mold grows.

E-200 UV-C probes mounted in duct over A-coil - Click for another view
The Air Probe Sanitizer in the photo above is indeed mounted in a duct, but it is illuminating the cold side of the A-coil and water drain pan underneath it as it should be.
(Click the photo for a different view).

If it is mounted elsewhere, then slime, algae, bacteria, and mold WILL grow on the cooling coil, drain pan, and even the blower and ductwork. As a consequence, these organisms will contaminate the air that you're breathing, throughout your living space.

Furthermore, this slime, algae, mold, and bacterial growth can eventually plug up your coil so air can't flow through it freely. This increases cooling costs and can even shorten the life of your central air conditioner. Your coil will NEVER plug up with a properly installed and maintained Air Probe Sanitizer equipped system. The coil will always look as shiny and new as it did when it came out of the factory.

The UV-C rays shining on the water droplets (the water condensing on the A-coil) increases the output of helpful hydroxyls (OH-), a naturally-occurring compound (a super negative ion) that scrubs pollution from the earth's atmosphere) and other compounds that destroy organic material such as mold, dust, germs, and pollen.



7. Purifying hydroxyls and negative ions


Must be produced by the UV-C system and must come out vents and registers.

This is very important to help keep dust and allergens out of the air. Hydroxyl ions are the key to actually destroying dust, pollen, mold spores, VOC's, and other organic compounds in the air.



8. It must keep the ducts and cooling coil clean.


The Air Probe Sanitizer does BOTH (Please see #1 above.). The duct-cleaning people hate these things!

Although cleaning is recommended in the case of mold- and gel-clogged A-coils, the UVC rays have been shown to actually clean a plugged coil (airflow increased from 10% to 80% in a month!)



9. Ease and cost of installation.


If installation is difficult, then installation will be expensive (or not done correctly). The Air Probe Sanitizer's different designs accommodate any air handler design you might run into.

There are a number of clear advantages in this regards of the Air Probe Sanitizer. For one thing, there are many, many different makes, models, sizes, and designs of air handlers (HVAC systems), and as a consequence, we often we have to make a custom-length Air Probe Sanitizer (or a special lamp spacing) to fit a particular air handler. And not only is there usually no extra charge should a custom length, lamp spacing, or mounting configuration is required, but many custom Air Probe Sanitizer lengths and different designs are stocked.

BEWARE. Inferior, similar-looking "in-duct" UV products have another major drawback: fixed designs with little flexibility. The main problem is that their dual-lamp model (used on almost all residences without exception) have a fixed lamp spacing. They just plain won't properly fit some air handlers, no matter what. And so they just don't do the job. And the only way you can make their unit work on some air handlers is to chop some holes in the sheet metal. Some homeowners don't like that, because it voids the warranty on their air handler.

Furthermore, on top of the fixed-lamp-spacing limitation, there's also only one mounting design, either for single-lamp or dual-lamp models.

You just don't stick one in a duct somewhere, or blindly mount it "on top" of the evaporator coil. If the lamps aren't mounted on the COLD AIR SIDE of the evaporator coil, and close to the coil so as to fully illuminate it, then the job is not done right. The flexibility of the different Air Probe Sanitizer designs and lamp spacings ensures a job done right, and a happy customer, every time.

The bottom line here is this: Flexible installation translates to quick installation, which in turn means the lowest possible installation costs.



10. Lamps supported at one end only.


This not only makes for easy installation and replacement, but doubles the area (and UV output) of the lamps.

The Air Probe Sanitizer is the original, patented single-ended lamp Ultraviolet-C HVAC* air purification system.

*Heating, Ventilation, and Air Conditioning.


11. Long lamp life.


Some lamps quickly drop in UV-C output, loosing their effectiveness. These lamps' UV output decreases less than 15% after a year (8760 hours) of continuous operation. This lamp life chart tells it all.



12. Number of lamps.
(two lamps = four lamps!)


Two lamps in one. The dual-probe units effectively give you four lamps, since each lamp is really two lamps in one, side by side, supported at only one end. You have to have enough lamps to provide enough UV-C energy to do the job.



13. Easy lamp replacement.


No UV lamp lasts forever. When it wears out, it needs to be easy to change. The lamps on the Air Probe Sanitizer just rock out of the sockets. Please see the video to see how easy it is.



14. Ruggedly built, yet light weight.


Both the lamps and the aluminum frame of the Air Probe Sanitizer are rigid and solid. The lamps are as highly resistant to breakage as possible.



15. Coverage area.


Dual-probe units purify and cleanse the air in even large houses. Multiple probe units can be built for any application, whether a home or a skyscraper.
The smaller one-probe "motel room" units can even do a small townhouse apartment.



16. Customizable at no extra cost.


Need a special length? Usually, there's no extra charge. The cost is based on the number of lamps, not the overall length of the unit.



17. Warranty and guarantee.


Two years, and this even covers the lamps! Details



18. A stable company.


We've been around since 1989, and we'll be around later when you need replacement parts, service, or a unit for your next house. About Comtech Research

The Air Probe Sanitizer is the original, patented single-ended lamp UV-C air purification system. There are cheap copies using inferior UV lamps, electrical systems, construction, but only the patented Original Air Probe Sanitizer can be legally sold and used.


The inventor recently met with the with the Internal Revenue Service and discussed installing this in their buildings and several other government buildings and offices. The IRS rep said:

'Before we called you, we thoroughly investigated you. You have the only valid patent for such a device, and none of the other patents should have been issued'.

The U.S. Standard for Government Buildings requires that "Ultraviolet light (C band) emitters/lamps shall be incorporated downstream of all cooling coils and above all drain pans to control airborne and surface microbial growth and transfer. Applied fixtures/lamps must be specifically manufactured for this purpose."

The Air Probe Sanitizer meets these requirements, are specifically manufactured for this purpose, and are installed in government buildings.



Much more information and further explanations are on the Air Probe Sanitizer page.



All UV-C lamps are NOT the same. Compare.

The Original Air Probe Sanitizer™ is the best air purification system available anywhere at ANY price.



"Air Probe Sanitizer" is a trademark.



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