Thingiverse
Covid Mask from Snorkel Facemask by SashimiTabernacleChoir
by Thingiverse
Last crawled date: 5 years, 7 months ago
Includes designs for simple adapters to allow air filters on both air inlets, and optionally on the outlet, of a "HJKB Full Face Snorkel Mask with double tubes". This mask uses unidirectional air flow - 2 inlets are in back and air is exhaled through a one-way valve in the front of the mask. The adapters accept the same press-in filter grids as in the Billings Montana mask. Provision is made for using multiple separated filter layers on the inlets, and you can even attach a bag around the inlets as a pre-filter that is easily swappable without removing the mask. For filter squares, look up the latest recommendations for the Billings mask, since filter recommendations seem to still be evolving.
A filter on the front one-way outlet valve is optional in situations where only the mask wearer needs protection from their surroundings. I am told that many N95s also have similar one-way outlet valves. But if nearby people also need protection from the mask wearer, the outlet filter adapter should be installed.
The safety or efficacy of this improvised modified mask design has not yet been tested in either clinical or nonclinical settings. Sterilization techniques specific to this mask have not been studied. Improvised filter materials vary in effectiveness. Do not use it if approved equipment is still available. Use at your own risk.
This design is specific to this exact double-tube snorkel mask and will not work on most other snorkel masks, since most use a different, single-tube design. As of 4/13/2020, the HJKB Full Face Snorkel Mask with double tubes is still available with fast delivery on Amazon. Other snorkel masks may be better adapted using: https://www.thingiverse.com/thing:4266047
Instructions. Print (2) of the filter shaped objects without support, and 4 of the Billings grids. If outflow filtering is desired, print the other cylindrical part and at least one more grid. Supports may be needed for this second part. Use PETG(preferred) or PLA. Other materials may be less safe.
Unpack the snorkel mask but do not attach the two snorkel tubes. Instead insert one of the funnel adapters into each inlet. Filter squares can be pressed into the square hole in the top of the funnel using the Billings grids. The design gives room to insert 2 grids if multiple separated filter layers are desired. The funnel tubed fit tightly but can be further secured to the body of the mask using the attachment point provided on the funnel. An optional prefilter can be made by wrapped blue shop towels or other filter material around the outside of the funnel as shown in one of the pictures. This can be quickly changed without removing the mask, and may deter splashes from reaching the inner filter material.
If the outlet filter is desired, press the piece over the large front outlet valve of the snorkel mask and add a filter square. It fits tightly, but securing it with tape or epoxy putty might be prudent to prevent any air leaks or inadvertent dislodging. There is also a second, lower outlet valve on the chin of the scuba mask, and this should be sealed airtight with tape or other material.
Disclaimer: Improvised devices of the type discussed herein are not NIOSH-approved. The user bears all liability associated with the use of such devices, this device in particular. I am making this information available as a public service, but I do not make any warranty, expressed or implied, that the use of the device described herein is safe or will protect a party from COVID-19 or any other airborne viruses.
A filter on the front one-way outlet valve is optional in situations where only the mask wearer needs protection from their surroundings. I am told that many N95s also have similar one-way outlet valves. But if nearby people also need protection from the mask wearer, the outlet filter adapter should be installed.
The safety or efficacy of this improvised modified mask design has not yet been tested in either clinical or nonclinical settings. Sterilization techniques specific to this mask have not been studied. Improvised filter materials vary in effectiveness. Do not use it if approved equipment is still available. Use at your own risk.
This design is specific to this exact double-tube snorkel mask and will not work on most other snorkel masks, since most use a different, single-tube design. As of 4/13/2020, the HJKB Full Face Snorkel Mask with double tubes is still available with fast delivery on Amazon. Other snorkel masks may be better adapted using: https://www.thingiverse.com/thing:4266047
Instructions. Print (2) of the filter shaped objects without support, and 4 of the Billings grids. If outflow filtering is desired, print the other cylindrical part and at least one more grid. Supports may be needed for this second part. Use PETG(preferred) or PLA. Other materials may be less safe.
Unpack the snorkel mask but do not attach the two snorkel tubes. Instead insert one of the funnel adapters into each inlet. Filter squares can be pressed into the square hole in the top of the funnel using the Billings grids. The design gives room to insert 2 grids if multiple separated filter layers are desired. The funnel tubed fit tightly but can be further secured to the body of the mask using the attachment point provided on the funnel. An optional prefilter can be made by wrapped blue shop towels or other filter material around the outside of the funnel as shown in one of the pictures. This can be quickly changed without removing the mask, and may deter splashes from reaching the inner filter material.
If the outlet filter is desired, press the piece over the large front outlet valve of the snorkel mask and add a filter square. It fits tightly, but securing it with tape or epoxy putty might be prudent to prevent any air leaks or inadvertent dislodging. There is also a second, lower outlet valve on the chin of the scuba mask, and this should be sealed airtight with tape or other material.
Disclaimer: Improvised devices of the type discussed herein are not NIOSH-approved. The user bears all liability associated with the use of such devices, this device in particular. I am making this information available as a public service, but I do not make any warranty, expressed or implied, that the use of the device described herein is safe or will protect a party from COVID-19 or any other airborne viruses.