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There are many wonderfully creative implementations of n95 masks and fabric holders, some of the most popular being from the Billings, MT and LowellMakes in MA.  As a collaboration between the Jeremy Ralston, Engineering Manager of the SLO Surgery Center, Cristian Sion, a Cal Poly Engineering student, and Clint Slaughter, MD, a local ER physician with Vituity, French Hospital ER, and SLO MakerSpace, we were able to bring the independent work we were each doing into a single project that remixes some other designs into a functional n95 respirator alternative.  

We have modified the Billings Respirator model to include a larger filtration area for better airflow, an extended chin area, thinner walls to allow heat-molding to a user’s face, and added a cap similar to the LowellMakes mask to allow the entire mask to be sanitized between patients.  This provides a safe, effective, and locally producible way to markedly extend the supply of n95 masks. 

This n95 holder is able to achieve subjective n95 fit testing on a wide variety of people, with the fit adjustable by heat molding and the installation of weatherstripping for comfort and an improved seal. This is not a NIOSH-approved device, but it functions as a holder for NIOSH-approved n95 material and we therefore consider this an extension of already approved equipment, which may allow for easier approval at your site. 

The mask can be 3D printed on home machines, any elastic, rubber band, or similar can be used for straps, and either properly handled used n95 respirators or new n95 disposable respirators can be used to make 1-4 SLOR masks. 

© 2020 by Additive Engineering, SLO MakerSpace, and San Luis Obispo Surgical Center