He meant Celsius. Damn metric system.....
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It HAD to be Fahrenheit. 350-400 C would be 630-720 F. Bye bye handle...
ETA:
I came across a chart (possibly elsewhere on MDS) with the amount of time the virus can live on various surfaces. Assuming that the filter medium is some sort of plastic, the virus will die after three days. So rotating 3+ masks or filters with no sterilization will logically allow any trapped viruses to expire on their own, thus self-sterilizing the filter medium.
As usual, this is just applied logic, which may be faulty but is better than nothing or destroying the filter via voodoo sanitization methods.
Here's the NIOSH Mask Respirator Decontamination link:
https://www.cdc.gov/coronavirus/2019-ncov/hcp/ppe-strategy/decontamination-reuse-respirators.html
I also heard last night that a mask sanitization device company in the midwest was close to FDA approval for their machines. Watch the daily POTUS presser (RSBN is the go to provider) for more info.