Yes, most have a low-temperature cycle and the rest can often be configured to include the option.

https://www.youtube.com/watch?v=0QKnqD7scI4 might be of interest.

I'd think an autoclave/pressure cooker/rice steamer would have a much lower risk of melting plastic fibers in masks since they're physically limited to lower temperatures than a typical oven.

According to the document, using an autoclave failed.

> Authors found decontamination using an autoclave, 160C dry heat, 70% isopropyl alcohol, and soap and water (20-min soak) caused significant degradation to filtration efficiency.

I think some saunas can get to that temperature.

I'm skeptical about that. You can easily put a bunch of masks in an oven at one time. There is no complication at all to that approach and no questions of coverage or distance (did your water vapor get all over the mask properly and at a high enough temp). The oven is fire and forget, pull after 30 minutes.

The oven is safer and easier by a wide margin.