absolutely. don't do this please. The filter is able to filter out particles smaller than 0.3um by using weak electrostatic forces. baking it will make the mask less effective. if you can just have a few masks that you rotate through... the best would be a 3 day rotation.

there's a good reason the CDC doesn't say to do this.

anyway .3 micron particles are the hardest for a mask to filter out because they are small and tend to go in a straight line more than the smaller particles. the filtration effectiveness of the mask is a u shaped curve with a trough in the region of the .3 micron particle sizes.