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. 2021 May 17:wxab020. doi: 10.1093/annweh/wxab020

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© The Author(s) 2021. Published by Oxford University Press on behalf of the British Occupational Hygiene Society.

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Figure 1. — (a) Thermocouple attached to FFR with Kapton tape. Photograph shows a 3M Model 8511 N95 FFR used for validating the process. All fit tests were performed with a 3M Model 8210 N95 FFR. (b) Thermal history of FFRs on top (light gray) and bottom (dark gray) shelves of oven over 10 cycles. (c) Representative example of four FFRs loaded into pouches and (d) in the Espec SH-242 environmental chamber.