1 random electrical tape very bad idea. Depend on brand of electrical tape this stuff can be treated with different anti rodent chemicals including stuff like Warfarin (Coumadin) so if you want someone to be using something and end up bleeding out out eyes use any random electrical tape in a breathing air system. Also some brands of electrical tape have different Flame Retardant chemicals some not human friendly because they can be cancer agents with long term direct exposure. Also there is a solvent problem from the glues they can use. Finally some brands will give you a lead problem as well.
There is HVAC/R rated electrical tape there is also the HVAC/R rated clear and duct tapes as well that when in contact with air flow are safer than the HVAC/R electrical tape. So even when you are using the right tapes you are not meant to use the electrical tape to seal up general air leaks that is what the clear HVAR/R tape or duct tape is for. Yes for a prototype using the wrong tape I can understand but you should not keep on using the wrong tape long term. Basically when it comes it air stuff that humans/animals will be breathing electrical tape is only for electrical stuff you have other tapes for the duct work to guide the air flow and it important to use them.
Also don't forget HVAC/R is not any old electrical tape or any old tape for the duct work.
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you want molded parts if possible. So parts need to be design with the concept they will be molded at some point. The surface of 3d prints is not ideal for this usage its normally too rough and allowing of bacteria growth. Yes in emergencies when you can disregard basic safety they will allow 3d printed parts.
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Question what is the required airflow. I guess general 120mm computer fan cannot provide it?
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Common issue with PAPR systems is when using them in less than clean air that there operational time between filter changes is reduced massively. In theory there is a solution to this.
https://en.wikipedia.org/wiki/Cyclonic_separation
Do notice how many bagless vaccum cleaners are in fact using Cyclonic separation. So if first stage filtration was Cyclonic this would reduce the material the rated filter material would have to trap.
Yes the idea of using hepa filters out of vuccum cleaners miss that you have a stage 1 filteration of either the bag or cyclonic separation before the hepa filter this is important to long time operation of that filter.
Yes people sourcing and converting filters design for other things for masks are normally losing the stage 1 filtration this results in that the material will be taking large material than it designed to.
Adding a stage 1 filtration to even to filters designed for masks will improve functional time because they will not come packed with material as fast.
Lets not just try to make a PAPR lets try to make a PAPR that has a feature that most of the common ones are missing.
There are many materials that can get to N95/p2 and above like thick towelling but these require some from of forced air system to make them functional.
1 random electrical tape very bad idea. Depend on brand of electrical tape this stuff can be treated with different anti rodent chemicals including stuff like Warfarin (Coumadin) so if you want someone to be using something and end up bleeding out out eyes use any random electrical tape in a breathing air system. Also some brands of electrical tape have different Flame Retardant chemicals some not human friendly because they can be cancer agents with long term direct exposure. Also there is a solvent problem from the glues they can use. Finally some brands will give you a lead problem as well.
There is HVAC/R rated electrical tape there is also the HVAC/R rated clear and duct tapes as well that when in contact with air flow are safer than the HVAC/R electrical tape. So even when you are using the right tapes you are not meant to use the electrical tape to seal up general air leaks that is what the clear HVAR/R tape or duct tape is for. Yes for a prototype using the wrong tape I can understand but you should not keep on using the wrong tape long term. Basically when it comes it air stuff that humans/animals will be breathing electrical tape is only for electrical stuff you have other tapes for the duct work to guide the air flow and it important to use them.
Also don't forget HVAC/R is not any old electrical tape or any old tape for the duct work.
you want molded parts if possible. So parts need to be design with the concept they will be molded at some point. The surface of 3d prints is not ideal for this usage its normally too rough and allowing of bacteria growth. Yes in emergencies when you can disregard basic safety they will allow 3d printed parts.
Question what is the required airflow. I guess general 120mm computer fan cannot provide it?
Common issue with PAPR systems is when using them in less than clean air that there operational time between filter changes is reduced massively. In theory there is a solution to this.
https://en.wikipedia.org/wiki/Cyclonic_separation
Do notice how many bagless vaccum cleaners are in fact using Cyclonic separation. So if first stage filtration was Cyclonic this would reduce the material the rated filter material would have to trap.
Yes the idea of using hepa filters out of vuccum cleaners miss that you have a stage 1 filteration of either the bag or cyclonic separation before the hepa filter this is important to long time operation of that filter.
Yes people sourcing and converting filters design for other things for masks are normally losing the stage 1 filtration this results in that the material will be taking large material than it designed to.
Adding a stage 1 filtration to even to filters designed for masks will improve functional time because they will not come packed with material as fast.
Lets not just try to make a PAPR lets try to make a PAPR that has a feature that most of the common ones are missing.
There are many materials that can get to N95/p2 and above like thick towelling but these require some from of forced air system to make them functional.