#Aranet4 data logger capabilities allows one to simply calculate air changes per hour (ACH) by taking CO₂ decay data & plugging it in to a typical decay rate ƒ(x)

Facility manager says these meeting houses are safe to code & highly energy efficient! I agree w/ the latter! 😉
Using a spreadsheet for the function. Applied data to various time segments, including a 50 minute segment while HVAC was on (mid section of graph), noted a slightly improved ACH, probably just mixing air.
Corrrected... the 0.007 is actually air changes per minute... LOL

0.43 is air changes per hour.
Here is a link to the live spread sheet. (Make a copy for yourself before playing around with the numbers).

docs.google.com/spreadsheets/d…

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More from @citlanx

Nov 3, 2022
It occurred to me yesterday (1 of maybe many reasons) why I have pulmonary fibrosis. I spent the spring of 2007 helping Dave Hansen restore this British Firefly. Dave passed away a few years ago of cancer. We used the meanest, strongest, paint stripper known to man; CH₂Cl₂ 1/n ImageImage
2/n

Today we talk a lot about ventilation because of the pandemic, yes, outdoor air is about as safe as you can get when talking about ventilation, I did a lot of the paint stripping outdoors, and didn't bother to where a respirator. Dave Hansen had a high tech paint booth,
3/n where he did most of the painting. He did don a N95, but that might not have been protection enough.

He was only 63.

probstfamilyfunerals.com/obituaries/Dav…
Read 6 tweets
Oct 30, 2022
@organichemusic Enovid I believe works.... not 100%, but has kept a bronchial infection at bay that my niece brought to our home last week from Mesa, AZ. Enovid seems to have some side effects, day 5 blurred vision that lasted most of the day, but went away. Otherwise seems safe. 1/n
@organichemusic 2/n When I went to the airport to pick up my brother & his daughter, my Vflex N95 was not in the center consol. My wife cleaned out the car. 🤦‍♂️Not knowing they might have any kind of illness at all, I wanted to wear the Vflex to be safe. I kept windows cracked and vent open.
@organichemusic 3/n I know Covid had ripped through their family a few weeks prior, but still wanted to be safe. Our home is well ventilated/filtered, we have MERV13 in the HVAC running 24/7, got 3 Winix D360s running 24/7 and a wood stove we keep piping hot so we can keep window open. But...
Read 15 tweets
Jun 2, 2022
Living w/guns & people off-their-rocker.

I was the hostage in this incident. I was on my laptop looking up the latest trends for influnza on the @CDCgov site. The waiting room was crowded/coughing & I was the only one wearing a mask, ASTM Level III.
1/
deseret.com/2005/1/26/1987…
2/ They I remember thinking when I first walked in to the waiting room, "This is not where I want to be right now" almost every seat was taken, and most everyone was coughing. A sign read, it is the flu season, if you want a mask, ask for one. No one was wearing one...
3/ I might just be the one to break the ice and more people will start wearing them when it matters most. Honestly it felt awkward, but I got the mask and put it on.
Read 16 tweets
Mar 6, 2021
Pricing left to right: $125, $249, $85, $60.
The first 3 are NDIR, the 4th is eCO2. I’ll post a bit later today comparison of ARANET4 with Sensirion SCD30 (not shown) but, both comparable to each other showing much higher CO2 ppm than the other 3 cheaper sensors. @kprather88
Both the $125 & $85 model use the exact same CO2 sensor, CUBE CU-1106 single beam NDIR.

#covidco2
The Aranet4 uses the Sunrise CO2 Sensor made by SenseAir which really seems to be lightyears ahead of any other NDIR technology. You can read up on it here. senseair.com/products/power…
Read 10 tweets

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