It is the best way to keep the portable air filter in front of you chest February 01 2023, 1 Comment
Where to keep the portable air filter ?
Most of time you may keep the portable air filter on arm (by belt). But the filter will move down position after a while, and it is not good for the blood flow if the belt is too tight.
I found the best way is keep the air filter in front of your chest by name card rope. It is no heavy, and free for arm.
You can try it.