Thingiverse
3M 7500 mask exhalation valve by Ksantor
by Thingiverse
Last crawled date: 5 years, 2 months ago
this small design was made for make your exhale filtered as inhale.With this mode your mask start to protect people around you if you infected and don't know about that.
HOW TO USE: Just add some filtering material like surgical mask (proper side!) or cotton disks (not recommend) and fit two parts together. I recommend to change filter every time before you leave/
In some countries health department prohibit to use respirators as they don't protect people around person who wear a respirator. Using this filter box with usual surgical mask or other filter material could help you to filter your exhale and de-facto explain to police why you can use respirator.
feel free to fit this design to your needs. I printed it from PETG and it fits as it is. But fit is very tight, may be you will need to scale second part down to 99%
Keep in mind that all DIY mask mods you use on your own risk. Also I recommend to use sealant (liquid of PFTE ribbon) for make it really tight fit without spaces to leave "infected" exhale leave.
HOW TO USE: Just add some filtering material like surgical mask (proper side!) or cotton disks (not recommend) and fit two parts together. I recommend to change filter every time before you leave/
In some countries health department prohibit to use respirators as they don't protect people around person who wear a respirator. Using this filter box with usual surgical mask or other filter material could help you to filter your exhale and de-facto explain to police why you can use respirator.
feel free to fit this design to your needs. I printed it from PETG and it fits as it is. But fit is very tight, may be you will need to scale second part down to 99%
Keep in mind that all DIY mask mods you use on your own risk. Also I recommend to use sealant (liquid of PFTE ribbon) for make it really tight fit without spaces to leave "infected" exhale leave.