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Here's some pop press releases from research at MIT, and Illinois Tech.
https://www.iit.edu/news/air-cleaner-lets-you-breathe-easier-not-so-fast-says-new-study - Tested the GPS device...

ere is a testimonial from another contractor that had testing performed before and after.

https://www.youtube.com/watch?v=k0b06ViT0_U

My customers personally have told me that the air feels...

The Duo -2000 includes carbon filtration. And carbon filtration does absorb Vocs very effectively. Not surprised it reduced TVoc levels. Unfortunately Carbon also saturates quickly. I've used 30lbs...

If you could send a link with user testing of the Westinghouse unit I'd be appreciative.

I tested a few weeks ago and did record any differences. I returned the unit to Amazon.

If you levels...

I've tested the Westinghouse purifier recently for Vocs reduction. It didn't work and generated and odor to boot.

Just posted some suggestions.

Here's something you can try immediately to see...

I misread your post earlier - sorry. .5 mg/m^3 is acceptable making some reasonable assumption.
But - 3mg/m^3 and 6mg/m^3 are very high and should be investigated. Please keep in mind the...

Teddy - Thanks so much for your comments - means a lot to me coming from you.

In 2015 I purchased a condo with unusual "smells".
I wasn't moving in for 3 months after I closed the purchase and...

Don't mean to be glib but your levels are reading higher because your concentrations are higher. I've noticed the same thing in my 3 level condo and I believe it's related to the location of my...

Reviews on Amazon for these IAQ devices are meaningless.

The first criteria is accuracy. And as far as VOCs and PM2.5 these devices just don't cut the mustard.

As far as trends go...

VOCs boil between 120 - 450F.
So what gets into the air is off gassing from liquids and solids on surfaces. Each 10F degree increase doubles VOC
off gassing.


VicVoQUOTE=jplee3;26144642]Hi...

No. TVoc levels are not arbitrary.
TVoc specifically means the weight of all Vocs in a cubic meter of air. In other words grab a cubic meter of indoor, separate all the Vocs and weigh them....

Without measuring the accuracy of the TVoc and PM sensors your review is, for me, useless.

I've got about 6 consumer monitors (including an Air Things model) and these devices are close to...

2200ng/L is very high.
A group from Harvard has published data the cognition is effected at levels >=500 ng/liter

I wouldn't worry about your formaldehyde for a couple of reason:
1. Home Air...

What's missing with all these PCO devices from numerous providers is data showing effectiveness in residential living spaces.

There is good data showing this technology can reduce very, very high...

I too am in Texas where currently dew points this time of year vary between the mid 60s to the low 70's. No change insight until mid Sept at the earliest.

I've got a confirmed VOC problem -...

You touch a pet project of mine that has been evolving for the last 5 years.

Before I ramble here's my view on the parameters you mentioned:

Temp/RH
For temp/ humidity there are, of course,...

I you you review the paper work from Home Air Check you will see that levels above 500 are reason of concern. 1700 is high!
I have the same issue.

A TVOC level of 1900 is Very high.
Any reading over 500 is reason for concern. Both LEEDs and the USGBC agree to that standard.
The reference from Home Air Check you quoted is derived from homes...

What was your TVOC number provided by Home Air Check?

I think particulates are suspect especially considering your history.
Buy, borrow or steal a Dylos are something compatible and monitor your...

Couple of things:

If you used Home Air Check for your formaldehyde test note that their results report high. Still your levels are much higher than typical. Not quite at WHO levels but close....

The Dyson is a poor performer.
The Canadian Broadcasting Network independently tested a number of particulate filters and the Dyson was a sub par.
...

Thanks for that. The application of the Daikin tool is unique but the innards are exactly the same as all the consumer based IAQ measurement devices that have hit the market in the last few years.
A...

Yes - And I posted my Super Duper Quadruple "DUH" two days ago.

Well - That's a big fat Quadruple DUH on me.

Just saw I was responding to a thread 12 years old

At least no harm/no foul.

HUH???
Sorry but when it comes to gases ventilation DOES work. That an undisputed truth that's almost as certain as the truth of long division.

150 ppm translates (using Isobutylene as an...

As far as your VOCs and CO2 goes your readings are very good.

BUT - I would allow a Big (possible very big) fudge factor for accuracy of your Air Things thingy.

For VOCs I'd recommend...

Very fair question. I apologize in advance for the long winded nerdy explanation that follows. My wish is for more folks like yourself to become conversant with this stuff to call out manufactures on...

The I-wave might reduce particulate pollution, but,contrary to the claims of GPS, will do nothing for VOCs.

Very interesting and nuanced findings.
From the Abstract:

Increases in PM2.5 and negative ion (NI) exposure were independently associated with increased urinary concentration of malondialdehyde,...

No it is not unique.

This technology is based on integrated circuit parts and modules from a variety of manufacturers
Accuracy varies depending the particular implementations used.

Some (not...

FYI - The mode of action of Fabrize is unique. The active element is a molekule called beta-cyclodextrin. Some VOCs will get trapped inside the beta-cyclodextrin molekule and will be out of reach of...

I second Ian's recommendation of the Dylos device for measuring particulate levels. The device uses the same technique, laser scattering, that is used in high cost industrial units and delivers an...

The GPS technology might be effective for:
1. particulates
2. biologicals - with restrictions

But I find their claims about VOC reduction unsubstantiated. They seem to confuse the meaning of...

Info on the web the BlueAir classic models include:
1. Large CFM capability
2. HEPA filtration - for particulates not VOCs
3. Electro Static grill to negatively charge particulates and collect on...

Curious how you determined your VOC levels. If you used one of the consumer MOS based meters that are readily available I'd be very hesitant in believing the results.

I'd recommend doing a Gas...

Hi Frank,

I'm really at my wits in dealing with overstated, under supported claims of various manufacturers regarding IAQ, especially with VOCs.[/B][/I]

I don't think GPS systems emit harmful...

Hey Frank,

i know this is a couple of year old, but I was speaking to Alpha Labs the other day and they mentioned they build the ion meters for GPS. They just label for GPS.
Thought you might be...

I would like to add that partial breakdown products of oxidants can be harmful. The data is mixed on this warning.
Also if these breakdown products are a problem steps might be undertaken to avoid...

This is very dependent on the oxidant in question.

Hydroxyls - the most potent oxidizer (other than fluorine) - as regards VOCs are harmless. The FDA and lab data both agree on this. These...

No difference. Same technilogy

I have doubts about GPS claims of VOC reduction.
Here's a quote from GPS's website:

"The ions breakdown harmful VOCs with an Electron Volt Potential under twelve (eV<12) into harmless compounds...

UVC doesn't literally burn through coils, it destroy biologicals living on coils -kills em dead.
No harm to your coil.

Thanks for the expansion and quantitative example.

Also thanks for correcting my bad physics. Smaller and larger system both remove sensible and latent heat the at same rates. They are, for the...

Very engaging thread. Blown away with the quality of replies.

I am not an AC pro, but I believe there is a reason why an over sized system will cool temps faster and dehumidify less proportionally...

Sounds good.

I've really been impressed with the aeroseal process. I've heard from reputable source of remarkable results.

Once all is said and done you should have any concerns with...

Haven't tested the new RGF device yet.
Here's my suggestion for you:

Determine if you even have a VOC issue.

Use the service of https://homeaircheck.com/products/ or...

Home Air Check can provide a testing kit and you return the sample. In a week or less you'll have a pretty accurate of reading TVOC including formaldehyde.
The lab used is highly credentialed and...

Also Evoaire, I believe, is an international manufacturer. I"d be interested in learning more about our technology.

Thanks

My understanding is that GPS does not offer money back guarantees.
If you know of a reseller/distributor that will loan me one I"d be willing to test.

And keep in mind testing cost me about...

Thanks for inquiring.

Not only vague but BS. Probably talking from someone in sales/marketing. He may not know better.
But
- UV Leds only radiate in the UVA frequency range. This frequency...