Mask Vent

UPDATE 1: 06/18/2020
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Added an updated locking ring with a spot for a filter to be added. Also added a locking ring cap that can be used in place of the original locking ring or as a cap for the filtered locking ring.
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This is my take on an exhaust vent for adding to either rubber/TPU/plastic masks or fabric masks, if you want. I hate having my face heat up because of wearing a mask, and I wear glasses from time to time, and they always fog up when I have a mask on. For this vent, cut a 25mm hole in your fabric, and thread this through, then tighten the locking ring to the fabric. Depending on your fabric, you may have to cut a smaller hole and stretch it around the barrel. Add the TPU valve seal (a.k.a. rubber disc) to the center peg. The disc is a very tight stretch, but it fits if you are patient.
This is intentional. This is modeled after the exhaust vents used in U.S. military (Avon) M50 gas masks.

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