Iterations | Version 1.0

BE Mask Version 1.0

| BECMv1



The BE Mask 1.0 (BECMv1) is a crisis mask design derivative of the Montana Mask. This iteration includes improvements to materials, assembly process, seal, sizing in relation to geometric scaling, and filter cartridge design.  It is an ongoing community effort that continues to adapt to meet the needs of those at the most risk.


Montana Mask vs. BE Mask 1.0


Montana MaskBE Mask 1.0
Mask Frame MaterialPLA body recommendedTPU body recommended
Sizing2 sizes (S – L) 
Custom scaling 
6 sizes (XXS-XS-S-M-L-XL)
Custom scaling
Filter TestingTesting with cut up N95 mask
(6 filters)
Polypropylene MERV15 
(single use, 2-ply)
Community forumNoYes
LicenceOpen Source
Non-commercial
Open Source
Commercial
ProductionNo Yes

Design Iteration


Materials

We made a design that can be printed in a semi flex TPU material which allows a seal without added gasketing materials.  We have researched other components to find the safest available materials and included our sourcing links.

Assembly

We have adjusted the eyelets in the design to ease the strapping assembly and support a wider range of materials.

Seal 

Both through the materials we’ve chosen and the scaling improvements, the mask seal has been a major focus for our team.

Sizing

We have developed a series of sizes to improve fit comfort for a variety of individuals across a span of ages to minimize leakage and improve safety.

Filter

We have added an interlocking filter cartridge lattice that protects the filter from making direct contact with the face.  We have also had success with a 2-ply filter providing an added layer of safety.


Sizing


The BECMv1 comes in 6 sizes; XXS, XS, S, M, L, and XL.  The sizes we have chosen are based on research and testing of common face geometries. 

Measure the distance between the bridge of your nose at the level of your eyes and the edge of your chin. Pick the size that is closest to your measurement. Mask should fit snugly, without gaps around the edge.  

A mask is only fully effective with the correct fit.


Mask Sizes (Chin to Nose):
XL: 134 mm (~5 1/4 in)
L:   131 mm (~5 1/8 in.)
M:  127 mm (~5 in.)
S:   122 mm (~4 3/4 in)
XS: 118 mm (~4 5/8 in)
XXS: 115 mm (~4 1/2 in)

Mask Size Details

XYZ
XXSmall86.16mm114.80mm74.31mm
XSmall92.45mm119.22mm74.31mm
Small98.36mm123.43mm74.31mm
Medium105.04mm128.05mm74.31mm
Large109.41mm131.88mm74.31mm
XLarge109.75mm135.04mm74.31mm

Filter Frame Size Details

XYZ
XXSmall35.57mm39.76mm9.9mm
XSmall40.56mm43.39mm9.9mm
Small43.15mm44.93mm9.9mm
Medium46.08mm46.61mm9.9mm
Large48mm48mm9.9mm
XLarge48.15mm49.15mm9.9mm

Printable Sizing Guide

Cut and use to measure user face for sizing. Dispose after each use.


Testing


Saccharine Fit Test

Report File: April 10 2020

3D PRINTED MASK TRACKING AND TESTING REPORT

(For Mask Fabricator)

MASK ID (code written on mask) Praveen’s
Mask Size (If applicable) Medium
Mask Material TPU
Filter Material  MERV-15
Other 
Wearer 1 (Female) – Medium
Mask Fit(Snug / Loose / Gaps / too large / too small)
Comfort(Comfortable / Uncomfortable)
Breathing(Acceptable / Unacceptable)
Breathing compared to N95 Mask(Same / Harder  / Easier)
Ease of donning mask(Easy to put on / Difficult to put on)
Filter Assembly(Easy to assemble / Too difficult / Confusing)
Comments: I did not change out the filter; overall comfortable 
Wearer 2 (Male) – Medium
Mask Fit(Snug / Loose / Gaps / too large / too small)
Comfort(Comfortable / Uncomfortable)
Breathing(Acceptable / Unacceptable)
Breathing compared to N95 Mask(Same / Harder  / Easier)
Ease of donning mask(Easy to put on / Difficult to put on)
Filter Assembly(Easy to assemble / Too difficult / Confusing)

Comments:

Other Testing
Saccharine Test Result Passed (wearer #1 female) Leak (wearer #2 male) 
Swab test (if performed, attach) 
Other test (describe) 
Other test (describe) 

Comments: Sizing was appropriate for wearer #1 (female) and inappropriate for wearer #2 (male).  

      Correct sizing may be critical for successful use.

3D PRINTED MASK TRACKING AND TESTING REPORT

(For Mask Fabricator)

MASK ID (code written on mask) 
Mask Size (If applicable) Large
Mask Material TPU
Filter Material MERV-15
Other 
Comments: I did not change out the filter
Wearer 1 (Male) – Large
Mask Fit(Snug / Loose / Gaps / too large / too small)
Comfort(Comfortable / Uncomfortable)
Breathing(Acceptable / Unacceptable)
Breathing compared to N95 Mask(Same / Harder  / Easier)
Ease of donning mask(Easy to put on / Difficult to put on)
Filter Assembly(Easy to assemble / Too difficult / Confusing)

Saccharine Test Result: Some Saccharine taste at very end of testing with head movements.

Comments: Improved performance.  Sizing may contribute to success.  

      Wearer #1 (male) may need an XL mask for complete seal

Conclusion

Testing supports the need for more than 2 sizes, which guided the design to include a series of 3-6 sizes. 


Files and Downloads


Download | STL files for BE Mask Version 1 (BECMv1). Includes 6 mask sizes and 6 filter frame sizes.