Indoor range filtration system and Covid 19
- Thread starter tinplas
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Appears that all this damn summer heat, the virus, the virus "rules, the "mobs", etc., etc. has the effect of making folks a little more short tempered! Not only in the communities, but even a little on here! 
Viral particles don’t really exist alone, they’re attached to water droplets/vapor.
This water sticks to things.
The chances of a droplet passing thru an HVAC system are extremely slim.
The data from transmission on ships was posted a while back. IIRC people on cruise ships and naval ships had a greater than 80% chance of not getting the virus. And these folks were in close proximity for looong periods of time.
But a slim chance still is greater than zero.
So I would take precautions if you’re high-risk.
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This water sticks to things.
The chances of a droplet passing thru an HVAC system are extremely slim.
The data from transmission on ships was posted a while back. IIRC people on cruise ships and naval ships had a greater than 80% chance of not getting the virus. And these folks were in close proximity for looong periods of time.
But a slim chance still is greater than zero.
So I would take precautions if you’re high-risk.
Sent from my iPhone using Tapatalk Pro
Some ranges have re circulation systems, some have single pass systems. Single pass is more expensive to operate but better imho.....Fresh air from outside is brought in, cooled and is exhausted through the filtration system back outdoors.....single pass..
Recirculated air must pass through HEPA filters before being reintroduced to the range. The air is cooler than single pass systems because of the re circulated air and usually less expensive on the electric bill...but the HEPA filters aren't cheap either......
The exhaust system should pull a negative atmosphere in the range pulling all air passed from the rear of the shooter towards the berm end of the range......in either system.
If shooters are separated by booth walls, I don't see not wearing a mask as a problem if you stay in the shooting booth.
Recirculated air must pass through HEPA filters before being reintroduced to the range. The air is cooler than single pass systems because of the re circulated air and usually less expensive on the electric bill...but the HEPA filters aren't cheap either......
The exhaust system should pull a negative atmosphere in the range pulling all air passed from the rear of the shooter towards the berm end of the range......in either system.
If shooters are separated by booth walls, I don't see not wearing a mask as a problem if you stay in the shooting booth.
Otherwise Congress would have been killed off by now.
I shoot at SPB NRH. I don't wear a mask when in the booth for the reasons mentioned above. Here is the company that installed the ventilation systems https://www.careyscentral.com/ Doesn't mean it "filters" COVID-19 though.
There have been multiple extensive studies showing that masks short of an N95 don’t protect from getting or transmitting virus.
“It should be concluded from these and similar studies that the filter material of face masks does not retain or filter out viruses or other submicron particles. 11,31 When this understanding is combined with the poor fit of masks, it is readily appreciated that neither the filter performance nor the facial fit characteristics of face masks qualify them as being devices which protect against respiratory infections.”
https://web.archive.org/web/2017051...atures/face-masks-dont-work-revealing-review/
Another one from CDC
“In our systematic review, we identified 10 RCTs that reported estimates of the effectiveness of face masks in reducing laboratory-confirmed influenza virus infections in the community from literature published during 1946–July 27, 2018. In pooled analysis, we found no significant reduction in influenza transmission with the use of face masks (RR 0.78, 95% CI 0.51–1.20; I2 = 30%, p = 0.25).”
https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article
In indoor ranges the air flow is directed down range and there are dividers between shooters so the risk is negligible. One concern I have with wearing a mask inside the range is lead exposure. It would seem inevitable that the mask would be coated with lead particles and other products of combustion. Then if you wear the mask around the rest of the day you would have a likelihood of being exposed to those particles.
“It should be concluded from these and similar studies that the filter material of face masks does not retain or filter out viruses or other submicron particles. 11,31 When this understanding is combined with the poor fit of masks, it is readily appreciated that neither the filter performance nor the facial fit characteristics of face masks qualify them as being devices which protect against respiratory infections.”
https://web.archive.org/web/2017051...atures/face-masks-dont-work-revealing-review/
Another one from CDC
“In our systematic review, we identified 10 RCTs that reported estimates of the effectiveness of face masks in reducing laboratory-confirmed influenza virus infections in the community from literature published during 1946–July 27, 2018. In pooled analysis, we found no significant reduction in influenza transmission with the use of face masks (RR 0.78, 95% CI 0.51–1.20; I2 = 30%, p = 0.25).”
https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article
In indoor ranges the air flow is directed down range and there are dividers between shooters so the risk is negligible. One concern I have with wearing a mask inside the range is lead exposure. It would seem inevitable that the mask would be coated with lead particles and other products of combustion. Then if you wear the mask around the rest of the day you would have a likelihood of being exposed to those particles.
I’m pretty sure your surgical mask isn’t going to filter lead.
https://pksafety.com/blog/lead-and-paint-fumes
A P100 particulate filter will. So don’t eat your filter after going to the range, and you should be fine.
I found the range experience with a mask to be less than pleasant as I couldn’t see squat with my safety glasses. I could use my respirator I guess. . . . .
As to masks, the surgical masks don’t filter out the aerosolized particles. They filter out the respiratory droplets, which is primarily the way the virus is spread. Which is why RN’s on a COVID floor (whom about half are just wearing a surgical mask and face shield vs a respiratory w/ face shield) are having about a 1%-3% conversion rate at my institution.
No tracheostomy, no Bipap, no Nebulizer medication, no aerosolized particles (or not much).
https://pksafety.com/blog/lead-and-paint-fumes
A P100 particulate filter will. So don’t eat your filter after going to the range, and you should be fine.
I found the range experience with a mask to be less than pleasant as I couldn’t see squat with my safety glasses. I could use my respirator I guess. . . . .
As to masks, the surgical masks don’t filter out the aerosolized particles. They filter out the respiratory droplets, which is primarily the way the virus is spread. Which is why RN’s on a COVID floor (whom about half are just wearing a surgical mask and face shield vs a respiratory w/ face shield) are having about a 1%-3% conversion rate at my institution.
No tracheostomy, no Bipap, no Nebulizer medication, no aerosolized particles (or not much).
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