You're supposed to wash a mask after each use. Disposable masks are good for just one time. There's no consensus on how long to wear a mask. I've seen people say no longer than four hours at the long end and whenever it feels moist it should be changed out. Mostly people working in service industries have them on for the longest periods of time. The longest I've had to have one on is about an hour, but that was just once. Usually the longest I have one on is when I'm grocery shopping, which only takes about 15-20 minutes for me.wapiti wrote: ↑Tue Dec 29, 2020 10:14 amSounds like a dirty filter/mask is ineffective in slowing the spread. How much wear time of a mask before it is dirty??? I would guess anywhere from 15 minutes to 2 hours depending on parameters. and if the wearer of the mask touches their dirty mask they will spread the virus when they touch other common touched surfaces. Thus mask wearing could be causing the virus to spread worse due to people touching their mask.iaafan wrote: ↑Tue Dec 29, 2020 8:41 amwapiti wrote: ↑Mon Dec 28, 2020 10:56 pmThe filter on the HVAC did not protect other people either.wbtfg wrote: ↑Thu Dec 10, 2020 11:40 amJust a reminder, the primary job of a mask isn't to protect the person wearing it.Cataholic wrote: ↑Thu Dec 10, 2020 11:18 amI talked to a doctor yesterday who actually had Covid. She believes that once it gets into HVAC systems, it is virtually impossible to stop the spread. She is also a strict mask wearer and still contracted the disease.The Butcher wrote: ↑Thu Dec 10, 2020 9:44 amPoor HVAC is a huge issue. One of the first measures the CDC came out with was increased air exchange, but aging facilities don't have the ability in many cases. Old schools and places of worship are the facilities that worry me the most.iaafan wrote: ↑Wed Dec 09, 2020 7:29 pmhttps://www.latimes.com/world-nation/st ... r-covid-19
Infected after 5 minutes, from 20 feet away: South Korea study shows coronavirus' spread indoorsFilters with MERV-13 or higher ratings can trap smaller particles, including viruses. Many home HVAC systems will have a MERV-8 filter installed as the default. Upgrading to a MERV-13 rated filter, or the highest-rated filter that your HVAC system fan and filter slot can accommodate, could improve the system’s efficacy in removing viruses from circulated air. Before making any changes to the air filter in an HVAC system, users should consult their HVAC manual or an HVAC professional.
https://www.epa.gov/coronavirus/what-ki ... y-covid-19By itself, using an upgraded HVAC filter is not enough to protect people from COVID-19. When used along with other best practices recommended by the Centers for Disease Control and Prevention, an upgraded HVAC filter can be part of a plan to protect yourself and your family.
Sounds like a filter, like a mask, helps stop the spread, but doesn't eliminate the threat of spreading COVID-19. I assume it's also possible for it to stop the spread of other airborne viruses like the flu and common cold.
I keep two cloth masks in each vehicle and take the one I just used in and wash it, then bring another out next time I use that vehicle. I also keep a box of disposable masks in my glovebox.
Do I think everyone does this? No, and I see your concern. I don't think anyone should be discouraged from using a mask or installing a better filter. The more people do this, the better for everyone.