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Despite this, I have heard very little about ventilation/filtration upgrades in offices or retail stores. Anecdotally, I've only noticed public air filters in a One Medical office (good job!)
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I have no idea how much commercial HVAC upgrades would cost, but as a lower bound: we could buy the same air filter that I have for dust control at home (~$400 MSRP for 350 cfm CADR) to cover all 97 billion commercial sq ft of real estate in the US for ~$110 billion.
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(Assumptions: retail prices of $400 per 350 cubic feet per minute of air flow, 97 billion sq ft of commercial real estate based on a random figure I found online, 12 ft average ceiling height to determine air volume, microCOVID goal of 5 air changes per hour.)
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Obviously, $110 billion is a lot! But... not that much on the scale of the trillions of dollars spent on COVID relief. I'd also expect that you could do a lot better than paying retail prices at country-sized volumes.
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The weirdest part is that I don't understand why this hasn't happened more? It's useful on the margin and doesn't require much coordination. As far as I know there are no regulatory barriers. I would preferably patronize businesses that advertised good ventilation or filtration!
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The best explanation I can think of is that good ventilation is illegible: unlike masks, it's hard for an individual to verify that an area is well-ventilated or well-filtered.
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Apparently Belgium has mandated CO2 meters in many public spaces (restaurants, bars, gyms), using CO2 as a proxy for fresh air ventilation (that is, air brought from outside). Filtration won't affect that, but it seems like a pretty good attempt at making ventilation legible.
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(Source for claims about Belgium, from what appears to be the government's official COVID info site: info-coronavirus.be/en/ventilation/)
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Either I'm missing something (and please tell me if you think I am!), or we're... just collectively making a terrible decision for no good reason? We're trapped in a bad state, and it's not even like we need coordinated action to make it much better. Any ideas?
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(I've not verified this in any way) Apparently teachers are trying to use air filters in their classrooms and getting told that they are... fire hazards? A large air filter draws maybe a few hundreds Watts.
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Replying to @j_g_allen
Fire codes- our district told us we couldn’t use them (we bought them for ourselves) because they’re a fire hazard.
Replying to
I wonder if this is an actual safety concern (albeit probably not one that outweight the benefit) a bureaucratic mixup, or someone on a power (ha!) trip.
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