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Frequently Asked Questions
about our IG-133- model series ionizers


What can I expect from your negative ionizers?
What are your guarantee and warranty policies?
Do your ionizers cause "black wall?
How do your ionizers compare to other brands?
What do negative ions do?
What about the Air Probe Sanitizer UV air purification system?
What is the best place to put an ionizer?
What is the difference between the ionizers?
What is the best way to place an order?
How long will it take to receive my order?
How are negative ions different from ozone?
Do your products generate ozone or oxides of nitrogen?
Will negative ions hurt my plants or my pets?


What can I expect from your negative ionizers if I buy one?


  1. You can expect to breathe freshened, purified air, with much of the pollen, dust, pet dander, and other allergy causing particles removed from the air in your room.
  2. You can also expect a large number of energizing negative ions to be produced externally, that is, out into the room away from the ionizer (and we include an ion detector with each unit to prove it). What's so special about that? Some other products with the word "Ion" in their brand name (or product description) produce only negative ions internally, and few, if any, negative ions actually leave the "negative ion generator" and go out into the room. Some actually generate positive ions.
  3. You can expect the negative ions to neutralize positive ions that emanate from your computer monitor.
    Many of our customers also report these results.

What are your guarantee and warranty policies?

Please click here to view our 60-day money-back satisfaction guarantee and two-year warranty.

"I would like to know if your ionizers make a dark spot on my wall. Mine [another brand] was sitting on the mantel."

We can count the number of 'black wall' complaints on one hand, and have fingers left over, for all the negative ionizers we've ever sold. You were probably burning dirty-burning candles, possibly with a lead wick (which would have sooted up the walls anyway, even with no ionizer present).
   It is possible, though, for any high-output negative ion generator to do this, especially if you place the unit too close to the wall and have high levels of pollutants in the air in your room. Burning some kinds of candles can do this, whether or not you have an ionizer.
   It sounds as if you live in an environment (or did live in one) that is either very polluted, if you have experienced a dark spot on the wall. We suggest that whatever ionizer you purchase, that you place it as far away from walls and other objects as possible. The mantel, close to the wall, is the wrong place to put any ionizer, ours or anyone else's. (See "What is the best place to put an ionizer" on this page). The ion emitter design, contrary to some claims you may have seen, has nothing to do with how much dust, etc. accumulates on the wall.
   Having said that, our DustGrabber™ (optional ionizer accessory) and the IG-133DG minimizes or eliminates dust and dirt on nearby objects when the ionizer is too close. The IG-133DG can be ordered with mounting brackets for mounting to the wall or ceiling.

How do your ionizers compare to "Brand X" ionizers?

Please click here to see this info on another page here.


What do negative ions do?

Please click here to see information on negative ions.

What are the specifications of the ionizers?
We have actually measured over 93 trillion negative ions per second output. And this goes up when something or someone gets close to the ion emitters. The actual ion output depends on the humidity* in the room and the condition** of the ion emitters. However, the usual level is 1,000,000 negative ions per cubic centimeter at 3 feet from the ion emitter on top of the unit.

In the past, we have not published ions/cm3 (ions per cubic centimeter) figures, because the actual negative ion density varies with the distance from the ion emitter, humidity, and air movement within the room. However, these ionizers do indeed emit a high and optimum level of negative ions into the room. The coverage is approximately 400 ft2 (400 square feet, a 20' by 20' area). That's 4000 cubic feet, if you have 10' high ceilings.

These compact units plug into any standard 120 volt AC outlet (other voltages available). Draws very little power (less than 1 watt!), so is exceptionally economical to operate.

The IG-133, IG-133A, and IG-133DG negative ionizers measure only 5 by 5.25 inches by 1.5 inches tall (up to 7 inches tall, including the ion emitter).

* The ion output decreases somewhat at very low humidity. This effect is minimized in the IG-133A and IG-133DG models.

** All ion emitters on negative ion generators deteriorate. However, Comtech Research has developed ion emitters on their negative ion generators which are user- renewable! Simply trim the ends of the fine wires on the SSE ion emitter (on top of the unit) occasionally with a pair of wire cutters, according to the instructions, to keep the ion output at its peak.
(Don't want to trim anything, but still want maximum negative ion output? Our optional CFE-2 long-life, maintenance- free ion emitter is available in our online store for an additional $29.95.)

What is the best place to put an ionizer?

We suggest placing the unit(s) on a table or nightstand, a couple of feet or more from other nearby objects, so that most of the negative ions go out into the room rather than being attracted to nearby surfaces.

You should not place your ionizer in places like these: inside a bookshelf, on a mantel directly against a wall, or right next to another object. Why not? Because in those situations, some negative ions will be drawn to the nearby object or surface instead of dispersing throughout the room as they should be.

Many of our customers put one ionizer in their bedroom and another one in their living area. You can place them about anywhere that you would like, with the guideline here in mind. You might experiment, that is, move them around and see which room is best for you. We suggest against putting any electrical appliance in a bathroom.

If you're only buying one ionizing air purifier, then experts suggest placing it in the bedroom (and we concur). Even though the negative ionizers are rated to cover 400 square feet with high density negative ions, it is really not necessary to get one for each room. However, it would be a good idea to place them where the air naturally is flowing from one room to another (the airflow will help carry the negative ions into the next room). Keep in mind that negative ions cannot travel from one floor to another (nor through walls).

If you have computers, placing an ionizer two or three feet from a computer monitor (to your right or left) will help neutralize the positive ions that emanate from the monitor. NOTE: an LCD monitor, such as used on a laptop/notebook portable computer does not produce positive ions.


What is the difference between the IG-133 and the IG-133A ionizers?

The model IG-133A has a metallic surface on top that improves the performance and ion output of the unit slightly. It is less susceptible to decreases in negative ion output when the room humidity is low, such as indoors in the wintertime (with no humidifier), in an air-conditioned room, or in a desert environment.

  • If you live in a dry environment (dry in any part of the year), we suggest that you order the IG-133A (or the IG-133DG) negative ionizer.
  • If you live in a humid environment year-round, you can order the original IG-133 negative ion generator and save $10.00.

What is the best way to place an order?

You may place a secure order online 24 hours a day here in our online store. You may also call us toll-free and place your order.

How long will it take to receive my order?

Items offered on our web site are stocked and usually ship the same day or the next business day.
Shipping times

How are negative ions different from ozone?

Click here to view the ozone FAQ.

Do your products generate ozone or oxides of nitrogen?

All our IG-133 series ionizers and the IG-1215 are genuine negative ion generators, not ozone generators. Some "negative ion generators" being sold are really ozone generators, and deliberately generate large quantities of ozone and positive ions (yes, that is true!) Ours do not. Neither do our ionizers produce any nitrogen oxides. Ozone FAQ

Some brands of "Negative ion generators" being sold by others are really ozone generators (or filters), and deliberately generate large quantities of ozone and positive ions. Ours do not.

Also, some "ionizers" sold by others do generate negative ions INTERNALLY, but few, if any, negative ions ever leave the unit and go out into the room. Most of these produce ozone. Please see the info on false advertising and misleading statements.

All our room ionizers manufactured by us (the IG-133 series models and the IG-1215) are genuine negative ion generators. They are NOT ozone generators.

Our IG-133, IG-133A, and IG-133DG ionizers put out almost zero ozone. And almost zero means immeasurable, once you get a few inches away from the ionizer.

We have a number of our IG-133A and IG-133DG ionizers here running 24/7, and we cannot smell ozone at all. We have a sensitive nose, and can only smell ozone if we stick our nose right next to the ion emitter (doing that increases the ozone production, by the way).

We do sell multi-purpose machines that emit both if you need ozone to rid your home of odors.

"On your IG-133A products page, it mentions 'Less than .02 parts per million ozone close to the emitter.' Would it be accurate to say it 'produces ozone only in trace amounts' "?

That would be somewhat accurate. But that statement implies that people are unavoidably going to be breathing small amounts of ozone. That is not the case.

Technically speaking, most corona-discharge type high-density ionizers emit a tiny amount of ozone as a by-product of generating a high level of negative ions. However, the ozone output is actually much less than .02 parts ppm, even within an inch or so of the ion emitter. Furthermore, the ozone levels even in a very small room would almost certainly never exceed safe limits, even if the ionizer is left running 24 hours a day. Ozone is an unstable, short-lived gas, and does not normally build up like you would think, unless you're generating enormous quantities of it on purpose.

Air circulation here is about as minimal as it gets. We have an ionizer in every room, and we don't have ozone. And some of the ionizers we've run were much more powerful than the ones we sell online. Not to mention that we also run an actual ozone generator (besides the ionizers) sometimes to get rid of stronger odors, such as manufacturing odors. That machine intentionally generates huge quantities of ozone, probably millions or billions of times the amount of that our ionizers put out.


"If a IG-133- negative ionizer was placed in a room were air circulation was minimal, how long would it take for the ozone produced by the unit to exceed safe limits for humans and animals?"

Ozone levels would almost certainly never reach, let alone exceed, safe limits*.  Ozone is an unstable, short-lived gas, and does not build up like other gases do (for example, natural gas or propane), unless you're generating large quantities of it on purpose.

We have an IG-133 series ionizer in almost every room (sometimes two or more), and we don't have a problem. And air circulation here is minimal. What is more, a couple of these ionizers are much more powerful than the ones we offer for sale here. We sometimes also run a large ozone generator besides the ionizers (to get rid of strong manufacturing odors in our shop which bother an asthmatic staff member here).

Anyway, all high-density negative ion generators generate a tiny amount of ozone near the ionizer. Ours can generate amounts well below the EPA standard of .05 PPM (less than .01 PPM), and then only very close to the unit. You will likely breathe in far more ozone around a photocopier. But here is the bottom line: ozone is an unstable, short-lived molecule, it is destroyed by other molecules of odors and pollutants in the air, and it is likely that no ozone would ever reach you.

We rest our case. :-)


* Maximum limits for ozone production by home electronics devices are .05 parts per million (ppm) in the USA, and .1 ppm in Europe.

The OSHA 8 hour exposure limit is 0.1 PPM. And even 0.05 PPM is a lot of ozone. The odor of ozone at that level would be quite strong and would almost certainly bother some people.


Will negative ions hurt my plants or my pets?

No. Negative ions are not toxic or harmful to either people or pets. We once even had a report that a particularly playful kitten chewed on an ion emitter while the ionizer was running, with no harm to the cat.

As for plants, they will likely help the growth of any plants you have nearby.




Negative ions information | Ions vs. ozone | Scientific research | Proof Positive
FAQ about the Air Probe Sanitizer



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