Headgear Instructions

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Build the Open-Mask v2.3 PAPR Hood

The Open-Mask 1 piece v2.3 PAPR Respirator Hood is now released! Download it, build one, let us know… 

Note: All Open-Mask.org devices are rapid emergency Prototypes that are not FDA approved

Materials List:
  • 1 yard coated Tyvek, Tychem or similar material
  • 1 yard of 1/8” round, up to 3/8” flat elastic
  • Avery 16741 or similar PETG file dividers for the face shield
  • 1 Hard-hat. We’ve used both 3M and Americana brands, Twist adjust are best. Different brands may involve slight deviations from the published instructions
  • A few small and medium zip ties
  • 1 Inlet connector. 3M or preferred brand. 3M Versaflo compatible 3D STL file is hosted below
Files: 
Directions:
  1. Cut out main pattern, doffing loop, double Inlet reinforcement patch and double retainer strap tabs from your material
  2. Progressively wrestle stitch a 3/4“ folded hem around the perimeter, creating a 1/2” hem tunnel for your elastic to be fished. We won’t fish the elastic through until the end.
  3. Stitch your 4“ crown loop at 3” points so it stays puckered open
  4. Double layer zigzag your inlet reinforcement patch, inside
  5. Zigzag 2 double layer retainer strap tabs to each side, inside
  6. Stitch 6”-8” of 3/8” flat elastic or similar to retainer tabs. Length varies due to elastic strength. 6” is typical.
  7. Rotary cut your screen material as noted on the pattern
  8. Carefully position screen inside hood and zigzag stitch to material.
  9. Carefully stitch the 2 chin darts together, starting at the screen end, softly fold the screen corner for ease, then stitch towards the hem, stopping at the hem stitch. Do not stitch past your hem stitch.
  10. Flip to outside up and slowly and carefully rotary cut the Tyvek covering the screen just inside your zig stitch using very little pressure so as not to damage the screen. Do this once, properly and carefully.
  11. Feed a fishtape/ coat hanger gauge wire all the way through the hem tunnel, then duct tape the end of 24 inches of 1/8“ round, up to 3/8” flat elastic and slowly pull through perimeter hem, pulling tails out rear and tie a knot. Tie second knot to adjust tension as needed.
  12. Remove the hard-hat internal 4 point crown suspension and insert into the hood right side up, and forward front. Loop the elastic retainer strap over and through the front brim section of the headgear. Double zip-tie to affix and insert inside the hood
  13. Cut the 1+” inlet hole, and affix your required fitting
  14. Test fit on your head. Adjust rear twister to size then pull shield over face and push/pull side retainer tab elastic to adjust fit everywhere including around ears. You can easily lift the faceshield up and over the brim for easy on and off test fitting
Open-Mask PAPR Hood v2.3
Open-Mask PAPR Hood v2.3
Open-Mask Hood v2.3 Instructions
Open-Mask Hood v2.3 Instructions
Open-Mask Hood v2.3 Pattern
Open-Mask Hood v2.3 Pattern
Open-Mask Hood v2.3 Pattern
Open-Mask Hood v2.3 Pattern
Open-Mask Hood v2.3 Details
Open-Mask Hood v2.3 Details
Open-Mask Hood v2.3 Details
Open-Mask Hood v2.3 Details
Open-Mask PAPR Hood v2.2
Front Looped and Ziptied Elastic Retainer Strap Detail

 

Open-Mask PAPR Hood v2.2
Elastic Retainer Loop and Inlet Stress Relief Details

 

Open-Mask PAPR Hood v2.2
Completed v2.2 Hood Including 3M Versflo Inlet Connector

 

Open-Mask PAPR Hood v2.2
More Front Head Crown Suspension and Retainer Strap Details

 

Open-Mask PAPR Hood v2.2
Inlet Connector Ziptie Stress Relief

 

Open-Mask PAPR Hood v2.2
Not Yet Looped Elastic Retainer Strap Detail

 

Open-Mask PAPR Hood v2.2
Crown Suspension, Retainer Strap and Inlet Ziptie Details

 

Open-Mask PAPR Hood v2.2
Note Forward Angled Strap Orientation

 

Open-Mask PAPR Hood v2.2
Completed Hood with Perimeter Elastic Removed

 

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