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. 2021 Feb;28(1):123–133. doi: 10.1177/1553350620964323

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© The Author(s) 2020

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. — HME filter with or without HEPA filter and under water seal sodium hypochlorite. Indian, Manipal modification for lap evacuator under seal sodium hypochlorite during COVID-19 response time.

Note. HEPA = high-efficiency particulate air; HME = heat and moisture exchanger.