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Re: Annual Meeting
Hey all,
apologies for sounding the alarm. As I mentioned ,the science is still very
unclear on this.
Here's the latest thread from the twitter AQI expert:
https://mobile.twitter.com/marwa_zaatari/status/1439101884229423106
There's a letter at the end warning about the dangers of the unproven
ionization technology.
At the same time, here are a couple papers that show removing the ionizer
reduces effective CFM of a blueair unit, and also that this group did not
detect ozone when using several air purifiers, including a couple blueair
models.
https://www.built-envi.com/wp-content/uploads/IIT-CADR-Testing-Blueair-211-August-2021.pdf,
https://www.built-envi.com/wp-content/uploads/IIT-CADR-Testing-February-2021.pdf
There's more digging to be done here if anyone feels so inclined.
On Sun, Nov 14, 2021 at 7:44 PM Austin Paul <austinjpaul gmail com> wrote:
> I actually have a BlueAir 311 I'm not using I'd be happy to bring in to
> the tower.
> 2 notes on the BlueAir though:
> 1. The filters are not officially HEPA, they are something else.
> 2. The BlueAir products have an ionizing chamber. The goal here is to
> blast particles out of the air, but the side-effect is creating reactive
> oxygen species like ozone, things it's better not to breathe. (Then
> again,
> it's also maybe not good to breathe the original particles?) The science
> here is really hard to nail down, with so many studies funded by the air
> purifier companies. There are guides online about how to take the
> ionizing
> unit out, which I would probably try to do.
>
> Laura had a guide from a Twitter IAQ (indoor air quality) expert that
> plotted circulation against cost, colored by noise with ionizing units
> highlighted. It might be informative to pull that up again before we
> purchase. On the other hand, I have a BlueAir in hand already.
>
> -AP
>
>
> On Sun, Nov 14, 2021, 18:09 Gregory Russell <gfr10598 gmail com> wrote:
>
>> I'm guessing Advent might be 14 x 14 x 16 (maybe 18), not counting the
>> vestibule. Probably want around 250 to 300 cfm.
>>
>> Looks like a BlueAir 311 or Coway Mighty would be appropriate CFM.
>> Wirecutter likes both, and looks like they rate Coway higher principally
>> on
>> price.
>> BlueAir might be quieter - I didn't find dB ratings for the Coway.
>>
>> I'd be in favor of going ahead with the BlueAir 311. I'm happy to order
>> one and be reimbursed sometime.
>>
>> On Sat, Nov 13, 2021 at 3:22 PM Cally Perry <cally perry gmail com>
>> wrote:
>>
>> > We’re pretty happy with our ridiculously quiet Blueair filters,
>> recommended
>> > by David Wilson that day the air quality dropped into the red here.
>> There
>> > have since visited multiple venues en masse.
>> >
>> > On Fri, Nov 12, 2021 at 6:55 PM John Schreiner <jeschreiner17 gmail
>> > com
>> >
>> > wrote:
>> >
>> > > My envelope calculation says 315 m^3/hr can cycle the air 5 times an
>> hour
>> > > in a space 15x15x10. 10’ is probably not the ceiling height in your
>> > > mother’s house, and also not in either tower, but it’s an
>> understandable
>> > > amount.
>> > >
>> > > John
>> > >
>> > > On Friday, November 12, 2021, <lauradi rcn com> wrote:
>> > >
>> > > > What we have in our bedroom and in two rooms in my mother's
>> house is
>> > > > this one
>> > > >
>> > > > https://www.smarterhepa.com/products/smart-health-s
>> > > >
>> > > > At the lowest level, it's very quiet. When one looks at the
>> specs,
>> > it
>> > > > states that it has a "Clean Air Delivery Rate (CADR) of 315
>> > > > m3/hr."
>> I
>> > > think
>> > > > for maximum virus protection, this is what one is supposed to have
>> per
>> > > > *minute* not hour, but we're hoping it's better than nothing for
>> > viruses
>> > > as
>> > > > well as allergens.
>> > > >
>> > > > Laura Dickerson
>> > > >
>> > > > ----- Original Message -----
>> > > > From: Cally Perry <cally perry gmail com>
>> > > > To: Austin Paul <austinjpaul gmail com>
>> > > > Cc: Andrew Tyler via Boston-change-ringers
>> <boston-change-ringers@
>> > > > cosmos.phy.tufts.edu>
>> > > > Sent: Fri, 12 Nov 2021 16:53:25 -0500 (EST)
>> > > > Subject: Re: Annual Meeting
>> > > >
>> > > > As promised, I sorted out where the square dancers got the idea
>> > > > that
>> > Hepa
>> > > > filtration was super useful.
>> > > >
>> > > > If you go to the microCovid site (Google will find it, but this
>> site
>> > > > strips links), and put in an approximate scenario (indoors, 10
>> people
>> > > > total, 3 feet apart, talking normally, etc., very approximate, but
>> > > there's
>> > > > no setting for One Person is Yelling at a time) and select the
>> > > Environment
>> > > > menu, one of the dropdowns is "Indoors with a HEPA filter (flow
>> rate 5X
>> > > > room size per hour) [1/4th the risk]
>> > > >
>> > > > I haven't researched the microcovid site, but it does seem as
>> though we
>> > > > might want to pony up for an air filter.
>> > > >
>> > > > Best,
>> > > > Cally
>> > > >
>> > > >
>> > > >
>> > > >
>> > > > On Sun, Oct 24, 2021 at 1:35 PM Austin Paul &
>> lt;austinjpaul gmail com
>> > > >
>> > > > wrote:
>> > > >
>> > > > > Hi everyone,
>> > > > >
>> > > > > Our Annual Guild Meeting will be Monday November 8th at 7:30
>> > > > pm
>> > > > online (in
>> > > > > stead of handbells).
>> > > > >
>> > > > > I will send out a zoom link closer to the time.
>> > > > >
>> > > > >
>> > > > > Best,
>> > > > > Austin
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