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Type: Posts; User: IndoorAirNerd

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  1. Replies
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    To address dust in a home issue, it is important...

    To address dust in a home issue, it is important to know where the dust is coming from. Easier said than done. Some top culprits include outdoor air, cooking, settled dust, clothing, skin cells,...
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    If you want the white noise, then an air cleaner...

    If you want the white noise, then an air cleaner can be a good thing. It won't cool you off like a ceiling fan, but it will deliver clean air and provide some white noise.

    Generally speaking,...
  3. cfdp, You need good filtration to target...

    cfdp,

    You need good filtration to target particles (which includes allergens) and you need outdoor air ventilation to target gases (which includes odors and VOCs). A hospital has both great...
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    Poll: I would recommend NOT using ozone in a home....

    I would recommend NOT using ozone in a home. Ozone is a respiratory irritant and it reacts with other chemicals in a home to create secondary products that are also harmful.

    Even if it is only...
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    I usually direct people to Consumer Reports. ...

    I usually direct people to Consumer Reports. Each year they review portable air purifiers: https://www.consumerreports.org/air-purifiers/best-air-purifiers-of-the-year/

    It's important to note...
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    I would only add that some dehumidifiers come...

    I would only add that some dehumidifiers come with a built-in condensate pump so you can keep it on the floor and pump it up to a drain. In my home, I have a Santa Fe dehumidifier in the sealed...
  7. It sounds like your primary concern is your...

    It sounds like your primary concern is your bedroom being poorly ventilated at night. High levels of CO2 in the bedroom have been associated with poor sleep quality, so I can appreciate the concern....
  8. To answer a few of your questions: -A rule of...

    To answer a few of your questions:
    -A rule of thumb air exchange rate for homes is 0.35 air changes per hour. If you know the volume of the air in your home approximately, you can calculate how many...
  9. Yes, you would get way too much bypass as air...

    Yes, you would get way too much bypass as air will travel the path of least resistance. At a minimum, add some tape to better seal it up.
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    Good summary randyf! I'm personally not a big...

    Good summary randyf!

    I'm personally not a big fan of low-cost VOC sensors. The metal oxide semiconductor sensors themselves cost $2 - $10 and get packaged into devices that sell for around $100 -...
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    It sounds like you are most interested in...

    It sounds like you are most interested in measuring particles. I personally use an optical particle counter that costs around $4,000. I have personally seen that a low-cost Dylos isn't too far off...
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    Electret - a filter that has fibers with an...

    Electret - a filter that has fibers with an electrostatic charge. This filter is not plugged in and doesn't produce ozone. Similar to an N95 mask.

    Ionizer / Electronic air cleaner / Electrostatic...
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    Poll: In this context, I would say the value of...

    In this context, I would say the value of ventilating continuously is that it will help remove the embedded musty odors, which was one of his primary goals. Ventilating unoccupied rooms helps dilute...
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    Poll: In general, mold needs carbon-based ("organic")...

    In general, mold needs carbon-based ("organic") materials for growth; something that was biological in nature. The paper-facing found on drywall (which once was a tree) has nutrients for growth, but...
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    Poll: I agree with the recommendation to do a detailed...

    I agree with the recommendation to do a detailed clean/wash. Mold not only needs moisture, it also needs food. And dust has sufficient nutrients for many species of mold to grow.

    If that doesn’t...
  16. UV bulbs, if designed to produce ozone, would...

    UV bulbs, if designed to produce ozone, would create oxidative stress too; albeit in a different way from ionizers. Bottom line you want to avoid oxidative stress. You see TV commercials for...
  17. The research didn't specifically look at the...

    The research didn't specifically look at the effects ionizers may have at reducing VOCs, viruses, and bacteria... it focused on oxidative stress that negative ions can cause when the ionizer is...
  18. New Research: Ionizers are "Negative" for Health

    A recent study found that the negative air ions generated by air-cleaning ionizers have a harmful effect on humans. Specifically the researchers found an increase in a biomarker of systemic oxidative...
  19. stieglj, Thanks for the 10 year follow-up. ...

    stieglj,

    Thanks for the 10 year follow-up. Did you regularly clean the CleanEffects? Unlike media filters which generally have their efficiencies hold steady or improve over time, electrostatic...
  20. I would follow what dieseldude suggested with...

    I would follow what dieseldude suggested with plywood, or even better, tape up some plastic sheeting which will be more air tight (although taking it down and putting it up would take more time than...
  21. Ionizers that claim to produce no ozone will be...

    Ionizers that claim to produce no ozone will be producing other reactive oxygen species (ROS). ROS aren't a big deal in an icemaker, but they could pose risks when in the breathing zone, especially...
  22. It seems a little weird that the RH of the air...

    It seems a little weird that the RH of the air immediately coming off the coils is only at 68%. When the coil is removing moisture via condensation, the air is at 100% RH (full saturation). Perhaps...
  23. Regarding air quality testing... sometimes these...

    Regarding air quality testing... sometimes these can help (VOC testing, mold testing, airborne allergen testing), but they don't always pinpoint the problem. Just like people over-promise the...
  24. I'm late to this discussion, but let me provide...

    I'm late to this discussion, but let me provide my 2 cents. To improve your air quality think about: 1) source control 2) ventilation 3) air cleaning.

    1) Source control: Are there chemicals you...
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    That's pretty good! A common indoor concentration...

    That's pretty good! A common indoor concentration of culturable mold is 200 colony forming units (CFU)/m3. If you had 100 CFM coming out of the supply register, you had around 1,000 cubic feet of...
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    A few various comments: 1. Yes, there can be...

    A few various comments:
    1. Yes, there can be partial breakdown products of oxidants such as aldehydes, namely formaldehyde. So you want to break down a complex VOC with 10 carbons down into smaller...
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    Having mechanical outdoor air ventilation...

    Having mechanical outdoor air ventilation (meeting ASHRAE Standard 62.2) and a good media filter (say MERV 11+) goes a long way. The problem with air cleaners using ionization (e.g. bipolar...
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    WAYNE3298, do you see HEPA filters much outside...

    WAYNE3298, do you see HEPA filters much outside of healthcare facilities? Other than portable HEPA units, which I see everywhere, I've only seen a few HEPA bypass systems in non-healthcare...
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    "Lies" about HEPA

    Most people don't understand how HEPA filters work. I just read yet another website that is seriously misinformed about HEPA-- or maybe they just lied to sell their alternative technology. Let me...
  30. To keep the HVAC system mold-free, most of your...

    To keep the HVAC system mold-free, most of your concern should be in the air handling unit and in the supply ductwork. These are areas where there is condensation and high relative humidity-- mold...
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    Middle of the Road Air Quality Sensor

    I had an AirAdvice several years ago. I own very expensive indoor air quality testing instruments (it's what I do). Many of the sensors on AirAdvice (temp, RH, CO2) were good enough, but VOCs and...
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