How NOT to Maintain a Healthy Home IAQ with Jienan Li (CIE 11 of 31)

Jienan Li (scholar.google.es/scholar?q=j...) lays out discoveries that have big implications for all pollution inside homes: the movement (partitioning) of volatile organic compounds (VOCs) in wildfire smoke from air onto surfaces and back again.
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[@jacobbarger1427]

I’m an hvac tech and found your videos initially for help with static pressure testing but found this series and I’m realizing how wrong I am about common hvac ways of cleaning air by blue lights/ I wave. Thank you so much for these videos they are helping me become a better technician!

[@HomePerformance]

THE DREAM IS ALIVE

[@ryansoo4000]

Hi Corbett! I was intrigued by the use of the word "proper" when discussing the proper method of cleaning. What is the proper method of cleaning? With all the soaps and sprays available I'd be concerned about leaving a slightly sticky film on everything that would just hold more dust and contaminants. That said, what do you think of those steam wands that clean a surface using just water? No soap, no residue, and the steams kills bacteria and other pathogens. Worth the money?

[@wesleywise6178]

Have they determined whether material lets the substances loose upon complete saturation or can they be released before? How did they determine what was being released from the material and what was just substance not being able to saturate within the material?

[@mjbates]

Do you think sunlight or heat can increase the speed at which the VOC's on surfaces are released back into the air? I'm just now putting this together but I've noticed my air quality monitors spiking in the early afternoon as soon as walls/floors around them are hit with sunlight.

[@sennafan105]

Quick question…increasing the ACH dilutes the pollutants produced by the inhabitants of a house…if building to passive house, there is no way I will allow the 0.33 ACH especially considering the amount of PM 0.1 and 0.3 particulates that would build up and reach our blood streams. I am building one now. Code worldwide only asks for a low ACH, doesn’t matter what filter you have, the rate of particle generation in a house with residents makes the inside of a home much much more polluted than the outside. We need to have an honest talk with the world about this simple fact.

[@HomePerformance]

No, filtration and dilution air via ERV are perfect for making indoors cleaner than outdoors actually. See here: New Toys!!! Extech VPC260 6-Channel Particle Counter for IAQ Testing kzbin.infoNfXL4SbYakQ?feature=share

[@johnwhite2576]

Corbett - how do you clean walls and ceilings though? They must consitute the bulk of surface area for storing and elevating these things ?

[@sennafan105]

Hi @homeperformance Trying to think of a way for you to see the issue with what you posted about the particle test etc and outside vs inside..I think best thing to try is this….light a cigarette/incense stick outside and inside and stand 1m away and test again with your machine (outside and inside) then repeat this so you a good average reading as you’re going to have wind outside and inside run your MVHR equipment on whatever speed you normally keep it on (I assume that means not in boost)…and then..I hope you see what the issue is for IAQ when you have dynamic changes such as walking around. Homes always have movement and interaction and that precisely the time when we should be testing. Back to my original point, I suspect the more you look at this and more you will conclude that we need higher dilution rates for improved IAQ. Remember most particles especially the harmful ones are less than 0.3 um.

[@superspeeder]

Corbett, I would love to see the pros and cons of carpet vs different hard floor options discussed at a scientific level. We’re building our house right now and I concede to my wife’s desire to have hard floors everywhere… everywhere but the bedrooms, that is! I would like carpeted bedrooms for noise and comfort reasons. She would like hard floors for aesthetic reasons, and of course so she can cover them with area rugs. Not joking. Is this something your series will look at from an indoor chemistry standpoint?

[@dahut3614]

You heard that part at 9:07 , right?

[@superspeeder]

@@dahut3614 he mentioned carpets twice, but nothing conclusive about them vs hard floors. I’ve heard carpets can be reservoirs for contaminants, trapping them until the vacuum beats them out and sucks them up, vs hard floors where those contaminants can be stirred up any time you walk over them. I would like to know if reliable studies exist to validate claims on either side, and whether the type of hard flooring or type of contaminant have an effect?

[@HomePerformance]

We have a lot on carpets in Home Diagnosis and previous vids, speeder, and the consensus is carpets are more contaminated, so vacuum often with a HEPA vac. There are reasons to choose carpet, but know the downsides.

[@superspeeder]

@@HomePerformance thanks!

[@joeshmoe7899]

Carpets can be cleaned? Not according to the laws of physics. I wonder how long, before carpets go the way of asbestos and cigarettes.