I recently got a Temptop M2000, which measures CO2, as well as particle levels (pm2.5 and pm10) and HCHO (formaldehyde). I got it because I'm interested in running some tests on my ceiling fan air filter idea, but now that I have it I want to measure everything. It logs to one minute intervals, and you can export to CSV.
The dance is in the basement of the Cambridge Masonic Hall, and the main room is 66x48 (3200 sqft) with about a 25ft ceiling (80,000 ft3). There are four ceiling fans which we keep on high. We have two large barrel fans, rated for 15,000 CFM on high. We put one blowing in at one end, and one blowing out at the other. In theory that might give us 11 ACH (60 min/hr * (80k ft3 / 15k ft3/min)) but I would expect to see lower performance than that: there are various obstructions, and there is nothing to stop air coming back in around the fan (the opening is not sealed around it).
Here's what I measured, with the monitor in a back corner where I expect the air is most stale:
Let's say your blades are a foot from the ceiling, and sweep a diameter of 52". Shroud the fan with a regular octagon of 12"x24" furnace filters, and the air will flow in through the filters and down:
I made some recordings, and I really like the sound I get when I mix a little external microphone into the main sound from the pickup. I also really like that this means when I run the pickups through distortion or a talkbox the crisp sound of the percussion is unaffected.
On 2022-03-04 I started taking 15mg of Meloxicam, daily with dinner. This is a nonsteroidal anti-inflammatory (NSAID), which often reduces arthritic swelling. I continued for a month, with my last dose on 2022-04-04. Unlike when I tried Methotrexate, I didn't notice any changes either when I started or when I went off.
To understand whether there might be a more subtle effect, I also checked my level of finger swelling each morning on waking by clasping my hands and seeing how tight it felt. I rated this feeling on a scale of 1 to 10, and all days were in the range 6 to 9 inclusive:
Of the 56 dances that have resumed, 31 (55%) require masks. Of those 31:
Now that high-filtration masks are widely available, it does seem like a weird compromise to require masking but allow low-filtration options like cloth or surgical, especially when I haven't seen anyone wearing a P100. Specifically:
Consider this traditional bass pattern:
Here's an example on piano:
Can we play this with just feet?
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