Open Source PAPR
Contents
Basics
- The formal name is "CAPR" or Controlled-Air Purifying Respirator
- A Device Mainly Used as a filtered/safe air supply in enviroments where there IS oxygen, and the user can breath normally (as in lung function isn't impaired), but a chemical/biological/particulate hazard exists/is expected
- Is essentially a forced air filter, with a hose leading to a mask
- Typically is a belt with the power/controls/filter, then a tube to a mask/hood
- A Similar "box" can feed a Positive Pressure Personnel Suit , a type of hazmat suit for bio uses (ie doesn't protect against heat (like firefighting "bunker suits" , or from certain liquids and/or radiation like other Hazmat suits
- Many DIY devices are essentially adapted CPAP machines
Usage
- Hood and hose are discarded after each use - [1]
- PAPR and general PPE protocols - [2]
- Used in Biosaftey Levels 3 and 4 (Medical, Bioscience, etc)
- Also useful for welding with large amounts of flux in non well ventilated spaces etc
Industry Standards
Welding
- A Welding Helmet and Respirator System by Miller
- 3M's Speedglass line
- All these go for ~1000-3000 USD (Welding Helmet part makes up the most, but still is most likely overpriced
- They typically include the welding eye protection, the air system, a hardhat, a hood, and a system of all these being integrated, and "slidable"?
Medical/Biosaftey
Existing Open Source Devices
2020
2019
Basic Design
Container
- Either a backpack, like in the video, or a 3d printed "shell"
Power Supply
- The associated electronics
- Preferabbly something swappable / Hot Swappable either (For Emergency need (ie we need something that "just works" NOW this may be a lesser need, even just throw a 9/12v battery in the backpack etc)
- A OTS System such as RYOBI 18V etc
- OSE System with the batteries in a 3d Printed shell with inserted metal contacts
Controlls
- Should be simple enough to use an arduino
- Indicators of flow and status MAY be needed to reach proper capability (if it fails you NEED to know if in a "Hot Zone")
Blower Fan
- Something with X M^3/H airflow (without filter) and Y M^3/H airflow (with filter)
- Either OTS or a 3d printed fan with ots motor, or fully open source
Filter Mount
- A Standard mount, and 3d Printed adapters for different cartriges
Filter
- Some sort of standard cartrige
- Contractor grade face mask cartriges should work for welding
- Due to the "END IS NEAR" supplies and the surplus military supplies, CBRN grade CAN be used, but is overkill and thus more expensive than need be in most applications
- Standard Biosaftey cartrige?
See Also
- COVID-19
- Ventilator
- Open Source Pressure Swing Absorbtion 99% Nitrogen/High Percentage Oxygen Device
