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  1. Randy Last night I did some more thinking on...

    Randy

    Last night I did some more thinking on why the Molekule device did not register any improvement in the indoor air quality. I believe the answer is air flow, or in this case, lack thereof.
    ...
  2. Randy Good summary. Well researched and clearly...

    Randy
    Good summary. Well researched and clearly written.

    Nicely done!!
  3. Try this: ...

    Try this:

    http://conference2018.resnet.us/data/energymeetings/presentations/RESNET2018_LBL_LowCostMonitors_walker.pdf
  4. Dr. Iain Walker of Lawrence Berkeley Laboratory...

    Dr. Iain Walker of Lawrence Berkeley Laboratory has done a very good analysis of low cost IAQ monitors. His findings are summarized in this Powerpoint presentation:
    ...
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    You can go to higher efficiency by using deeper...

    You can go to higher efficiency by using deeper filters. The increased surface area of a 4" or 5" filter substantially reduces resistance.

    This article explains the concept in more detail and...
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    The 80cfm airflow rate of the Molekule is a major...

    The 80cfm airflow rate of the Molekule is a major problem. Here's why:

    When an air cleaner is in use indoor particles levels (and VOC's) are a function of the following:
    outdoor to indoor...
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    Randy Good discussion. Your research is well...

    Randy

    Good discussion. Your research is well done and impressive.

    My point about Dr. Godswami is that he made the point to emphasize his credentials and that he is an "expert." He was...
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    Randy I am not sure what your point is. Sure...

    Randy

    I am not sure what your point is. Sure the PECO technology is questionable - particularly when it comes to the unintended byproducts of the chemical reactions. I have never been convinced...
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    To confirm this statement, Dr. Goswami clearly...

    To confirm this statement, Dr. Goswami clearly does not know very much about filters. He may be a highly regarded scientist in some field - but not filtration. Anyone with even a rudimentary...
  10. I am not sure where you are getting your...

    I am not sure where you are getting your information that the Carrier Infinity uses the same technology that hospitals use. Hospitals required to use certain levels of filtration. This article will...
  11. We tested the Carrier Infinity several years ago....

    We tested the Carrier Infinity several years ago. It did not emit a large amount of ozone.

    However, replacement filters are expensive. At the end of the day this product does not perform better...
  12. A good rule of thumb on 12" box filters is that...

    A good rule of thumb on 12" box filters is that you change them at twice the initial pressure drop. A filter like this generally has a pressure drop of 0.45"-0.55" wg at 2000 cfm. Pressure drop...
  13. AK It sounds like the "indoor allergens" you are...

    AK
    It sounds like the "indoor allergens" you are most concerned with are dust mites and mold. The other allergens on your list are outdoor allergens.

    Reducing humidity below 50% is an excellent...
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    Austin Air has been in business for about 20...

    Austin Air has been in business for about 20 years. They make high quality HEPA air purifiers that are both effective and reliable. I have had one running in my bedroom since 1997. It makes a big...
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    There seems to be somewhat of a misunderstanding...

    There seems to be somewhat of a misunderstanding on the resistance of thicker pleated filters versus thinner pleated filters. Given the same media (fabric) a thicker pleated filter will always have...
  16. Sorry for the delay in responding. I will try to...

    Sorry for the delay in responding. I will try to answer your question, but it has been a few years since I did some of these tests. The Lennox HC16 is a very efficient filter. The best part is...
  17. This article sums up my views on the GPS product....

    This article sums up my views on the GPS product.

    Alchemy, Indoor Air and the Black Box

    By Jim Rosenthal, 3/17/2006

    Be wary of excessive marketing claims for products to take care of...
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    rh You need to stay away from any filter that is...

    rh
    You need to stay away from any filter that is going to restrict your airflow. With a 14X18X1 filter opening my bet is that you have marginal or insufficient return air in your system the way...
  19. What is this? A cheap advertisement for a bad...

    What is this?

    A cheap advertisement for a bad product.

    Sickening!
  20. Replies
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    DR For the average consumer the IQ Air is an...

    DR
    For the average consumer the IQ Air is an excellent product with very high efficiency and good air flow.

    Your comparison of the IQ Air to the Biological Controls M800 is like someone...
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    A We have also discussed the pros and cons of...

    A
    We have also discussed the pros and cons of the Bi-polar ionization on this site. This technology creates OH (hydroxyl radicals) in the occupied space and is potentially more damaging than the...
  22. Real Science vs. Fake Science: How Can You Tell Them Apart?

    This is an excellent article on real science vs. fake science and how to tell the difference when it comes to products. the emphasis is on health products but the basic points apply to many of the...
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    Using three Filtrete filters is a waste of your...

    Using three Filtrete filters is a waste of your money. Visible particles are over 10 microns in size. Any pleated filter will remove close to 100% of the particles of this size that reach the...
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    The only time your vacuum would be a dust creator...

    The only time your vacuum would be a dust creator is when you are vacuuming or for about 30 minutes thereafter.

    My guess is that the blown in insulation and the protrustions from ceiling fans...
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    In my experience the most common causes for...

    In my experience the most common causes for excessive dust are: 1. cellulose insulation and 2. protrusions in the ceiling for recessed lights, etc.. Do you have either?
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    SA66 I am not sure I understand your question. ...

    SA66
    I am not sure I understand your question. But here is some information that might be helpful.

    In the ASHRAE 52.2 Standard there are 7 acceptable flow rates at which tests can be run. They...
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    I agree with pm. After reading these so called...

    I agree with pm. After reading these so called "scientific reports" I see nothing that indicates that this technology is safe or effective for indoor environments. Once again, what we see are...
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    AMG Both the REME and the Guardian Air use the...

    AMG
    Both the REME and the Guardian Air use the same photohydroionization (PHI) technology. Do you really think the outcome would be different? The small reduction in particles from ionization is...
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    Picture of the experiment with PHI and terpene - particle count

    306341
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    The "testing data" on the website is from...

    The "testing data" on the website is from laboratory tests done in chambers the size of a microwave oven. You could achieve the same results by turning on the microwave. They do not apply to indoor...
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    AMG OK, so we are supposed to believe that the...

    AMG
    OK, so we are supposed to believe that the Air Knight (installed on the supply side) is going to charge particles in a house, make them stick together and be easier to pick up by the air filter...
  32. JJ I really don't know how the Nordic Pure...

    JJ
    I really don't know how the Nordic Pure filters compare with others without seeing their test results. I have not tested these filters myself. As far as the comparison with 3M filters it would...
  33. These filters are fairly restrictive to airflow. ...

    These filters are fairly restrictive to airflow. Obviously, they are not ok for your system.

    I would recommend going with a standard pleated filter and chalk this up to experience. But you have...
  34. Thread: UV Lights

    by breathe easy
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    Well said, Ir. Not only is mixing of the air a...

    Well said, Ir. Not only is mixing of the air a problem but most particles will not stay in the air long enough to be exposed to the UV light for multiple passes. So only a relatively small...
  35. So, you have confirmed exactly what this thread...

    So, you have confirmed exactly what this thread is about - UV lights will destroy any materials made of hydrocarbons exposed to the UV lights. This is a major problem since buyers are not informed...
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    It is possible that this individual is sensitive...

    It is possible that this individual is sensitive to ozone. No harm in turning their ionizer off for a week and seeing what happens with the "experiment."

    It does not sound like your HVAC system...
  37. Thread: Allergies

    by breathe easy
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    TB I think you missed the point. I did not say...

    TB
    I think you missed the point. I did not say that ventilation and dehumidification are not part of comprehensive allergen avoidance. What I said was that they are not a cure all. Proper...
  38. Thread: Allergies

    by breathe easy
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    TB It is hard to stay mad at someone when they...

    TB
    It is hard to stay mad at someone when they apologize. In fact, I did see your ad and I applaud you for supporting this site. However, I think you will agree that mention of a product in a...
  39. Thread: Allergies

    by breathe easy
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    Teddy Bear - pay for your advertising

    TB
    Your response is a blatant advertisement for your product. You forgot to mention you sell Ultra-Air.

    If you want to advertise on the site, pay for it. Otherwise you need to keep your...
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    Jim Davis, I think you must have missed some...

    Jim Davis, I think you must have missed some decimal points somewhere. The levels you state are at least 100 times greater than acceptable limits.

    The FDA and UL limits for air cleaning devices...
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    In medical applications a MERV 14 filter needs to...

    In medical applications a MERV 14 filter needs to be installed downstream from the coil. The purpose is to pick up any contaminant from the coil. I am not sure what standard you are using for this...
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    Good point. I just received my AHR Expo show...

    Good point. I just received my AHR Expo show review for the January meeting in Chicago. There are three new in-duct devices that use the same "technology" - presumably supported by the same...
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    If it works in an oven, why wouldn't it work...

    If it works in an oven, why wouldn't it work installed in a duct? Two reasons - the laws of chemistry and physics.

    The PHI device activates Reactive Oxygen Species (ROS) like ozone, hydroxyl...
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    SPB Of course, I read the whole thing. In fact,...

    SPB
    Of course, I read the whole thing. In fact, I read 10-20 studies a week on a variety of different indoor air and allergy and asthma related subjects. What I have found is that one has to stick...
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    SPB Do I have proof that none of the tests were...

    SPB
    Do I have proof that none of the tests were performed for a PHI system actually in use in a duct? Interesting. You would think it would be the other way around. The manufacturer producing the...
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    SPB I am not sure where you get the idea that...

    SPB
    I am not sure where you get the idea that this device would "clean MRSA out of the air of a 2,000 to 3,000 foot home." There are no tests that show this. If you know of any, please provide...
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    SPB This is a piece of marketing literature. ...

    SPB
    This is a piece of marketing literature. These are not valid test results for a whole house system. But this is a good example of how one can take a little bit of truth and make a big story...
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    RJ The Honeywell and Lennox filters are slightly...

    RJ
    The Honeywell and Lennox filters are slightly thicker and therefore would have a slightly lower resistance. But in a residential system this small difference would have very little effect on...
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    pm The combination of efficient pleat media and...

    pm
    The combination of efficient pleat media and activated carbon has been around for a number of years. The theory is that the activated carbon is dispersed on the media and therefore has a large...
  50. g and pm Interesting article. As you may have...

    g and pm
    Interesting article. As you may have guessed I am not surprised by its conclusions. I have been saying for years that the release of Reative Oxygen Species (ROS) in indoor spaces is not a...
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