I so appreciate the work House Fresh is doing. Quality informative videos and blog posts. I often share your article re: best purifiers for viruses. It seems like filter quality is an important factor for virus mitigation measures. Any thoughts? Thank you so much for all you share!
Thank you. Filter grade can increase first pass filtration but these air purifiers work with multiple passes so actually using lower grade filtration mean they can run quicker at removing tiny PM1 particles. We have seen this with the DIY Corsi-Rosethenal boxes that use MERV 13. So you can have increased airflow so more passes across the filters and much quicker performance than using higher grade like H13. As you get lower than MERV 13 this becomes a problem and will clean much slower as much lower % is caught in the filter on each pass. Using HEPA H13 grade you can be more confident that the first pass of air will be cleaner than using lower grades. That is why is generally reccomended for healthcare settings but need higher volume of air. I have seen great speed of PM1 and PM2.5 removal from the use of lower grades like E11 and is a good option for small or mid-size air purifier as could remove all particles quicker than using HEPA H13. I have seen some research including: "Particulate matter (PM2.5) as a potential SARS-CoV-2 carrier" www.nature.com/articles/s41598-021-81935-9 Which suggests PM2.5 can be carryiers of virus so a good type of particle to remove quickly to reduce risk. I think that is why most of the new DIY air purifier don't use HEPA grade filters but I could also see some use cases of better first pass filtration.
6:05 "...now this is under the 70 decibels that would cause hearing damage..." It's not really appropriate to say that 70 dB *would cause* hearing damage. 70 dB is normally treated as the point where the risk of hearing damage is now possible. 85 dB could be reasonable to say *would cause* hearing damage (with a long term exposure). Remember that due to decibels being a logarithmic scale, roughly each 3 dB increase is actually a doubling of the sound intensity (although humans don't actually perceive it as double as loud). Now in most workplaces regulations, a noise level of 90 dB can actually be allowed over an entire 8 hour period. And in most cases, if an employee will be exposed to 85 dB over 8 hours the employer is required to provide hearing protection at no cost.
A removable pre-filter is a big plus although you do also need to remember to clean it. We tested the same unit with a dirty pre-filter and saw drops of 30-40%!
Can add ot the list. Do you think this model: snapklik.com/en-gb/product/intellipure-ultrafine-468-air-purifier-white-ideal-for-medium-or-large-spaces-up-to-1200-square-feet/02DO4P97XJ4F5
We here at NYC never fail to dump money down the drain due to buffoons running things. Just look up what's going on with our Mayor Adams now.. Utter disaster.
Sound level alone is not a good metric. It needs to be Sound level per Volume of Air. Who cares if TURBO is Loud, if it moves the most air. Or if it moves simular air volume to other devices on HIGH, you may find that the volume on HIGH is also comporable to other units. It is not apples to apples if you don't account for air moved.
Agree on its own it’s not enough but it’s still useful when benchmarking as if a similar unit had the same performance but is 15 dBA more that seems like something a consumer might be interested in. I also retest air purifiers running at lower fan speeds as we did in this review so you can also see what happens to performance at these lower sound levels. Was this not useful? I’m very much open to feedback you have!
Also to be clear on this device it was much louder than most of the other air purifiers I have tested and they also cleaned more air at the lower sound levels.
An aside from the video, I just noticed you sell t-shirts on your website with the text, "Ask me about my air purifier." Haha, love your channel!
Oooooh!!! Thank you for this comment. I'm definitely getting one and now I'm getting ideas!😅
I so appreciate the work House Fresh is doing. Quality informative videos and blog posts. I often share your article re: best purifiers for viruses. It seems like filter quality is an important factor for virus mitigation measures. Any thoughts? Thank you so much for all you share!
Thank you.
Filter grade can increase first pass filtration but these air purifiers work with multiple passes so actually using lower grade filtration mean they can run quicker at removing tiny PM1 particles.
We have seen this with the DIY Corsi-Rosethenal boxes that use MERV 13.
So you can have increased airflow so more passes across the filters and much quicker performance than using higher grade like H13.
As you get lower than MERV 13 this becomes a problem and will clean much slower as much lower % is caught in the filter on each pass.
Using HEPA H13 grade you can be more confident that the first pass of air will be cleaner than using lower grades. That is why is generally reccomended for healthcare settings but need higher volume of air.
I have seen great speed of PM1 and PM2.5 removal from the use of lower grades like E11 and is a good option for small or mid-size air purifier as could remove all particles quicker than using HEPA H13.
I have seen some research including: "Particulate matter (PM2.5) as a potential SARS-CoV-2 carrier"
www.nature.com/articles/s41598-021-81935-9
Which suggests PM2.5 can be carryiers of virus so a good type of particle to remove quickly to reduce risk.
I think that is why most of the new DIY air purifier don't use HEPA grade filters but I could also see some use cases of better first pass filtration.
Now this is what a channel should do, TEST..
Thank you, without testing you have to rely on manufacters claims which in my experience is a little dicey.
Somebody got a bribe...
When you don't do your research
I couldn't possible comment but reading that Gothamis article does suggest something things were done that shouldn't.
It was a tricky time and I wish our channel was around as maybe we could have helped.
6:05 "...now this is under the 70 decibels that would cause hearing damage..."
It's not really appropriate to say that 70 dB *would cause* hearing damage.
70 dB is normally treated as the point where the risk of hearing damage is now possible.
85 dB could be reasonable to say *would cause* hearing damage (with a long term exposure).
Remember that due to decibels being a logarithmic scale, roughly each 3 dB increase is actually a doubling of the sound intensity (although humans don't actually perceive it as double as loud).
Now in most workplaces regulations, a noise level of 90 dB can actually be allowed over an entire 8 hour period.
And in most cases, if an employee will be exposed to 85 dB over 8 hours the employer is required to provide hearing protection at no cost.
Sorry about that. I will be more accurate next time, and thanks for making me aware.
@@HouseFresh No problem, your content is great.
I’ve been using wings forever, and they have a pre filter you can vacuum to help keep the other filters cleaner longer..the intelli doesn’t..
A removable pre-filter is a big plus although you do also need to remember to clean it. We tested the same unit with a dirty pre-filter and saw drops of 30-40%!
I think the Intellipure full size model would be a good one to test.
Can add ot the list. Do you think this model: snapklik.com/en-gb/product/intellipure-ultrafine-468-air-purifier-white-ideal-for-medium-or-large-spaces-up-to-1200-square-feet/02DO4P97XJ4F5
But the bottom line even in 2024 as of December 9th, these machines are the best efficient ones out for the price and size
How did you come to that conclusion? Did you watch my video?
$90 million… wow
Does seem a lot but those cities have a lot of schools.
@@HouseFresh yeah I guess they do! But it still feels like A LOT considering the performance
We here at NYC never fail to dump money down the drain due to buffoons running things. Just look up what's going on with our Mayor Adams now.. Utter disaster.
Sorry to hear! Will read up on Mayor Adams.
0.14W at low speed? Is the fan even spinning?
Yeah very low, I would expect if I tested at this speed it would be close to the time of natural ventilation. Can't waste 5-6 hours on this though.
Sound level alone is not a good metric. It needs to be Sound level per Volume of Air. Who cares if TURBO is Loud, if it moves the most air. Or if it moves simular air volume to other devices on HIGH, you may find that the volume on HIGH is also comporable to other units. It is not apples to apples if you don't account for air moved.
Agree on its own it’s not enough but it’s still useful when benchmarking as if a similar unit had the same performance but is 15 dBA more that seems like something a consumer might be interested in.
I also retest air purifiers running at lower fan speeds as we did in this review so you can also see what happens to performance at these lower sound levels. Was this not useful? I’m very much open to feedback you have!
Also to be clear on this device it was much louder than most of the other air purifiers I have tested and they also cleaned more air at the lower sound levels.