![High-Efficiency Particulate Air Filters in the Era of COVID-19: Function and Efficacy - David A. Christopherson, William C. Yao, Mingming Lu, R. Vijayakumar, Ahmad R. Sedaghat, 2020 High-Efficiency Particulate Air Filters in the Era of COVID-19: Function and Efficacy - David A. Christopherson, William C. Yao, Mingming Lu, R. Vijayakumar, Ahmad R. Sedaghat, 2020](https://journals.sagepub.com/cms/10.1177/0194599820941838/asset/images/large/10.1177_0194599820941838-fig2.jpeg)
High-Efficiency Particulate Air Filters in the Era of COVID-19: Function and Efficacy - David A. Christopherson, William C. Yao, Mingming Lu, R. Vijayakumar, Ahmad R. Sedaghat, 2020
Criteria for calculating the efficiency of HEPA filters during and after design basis accidents - UNT Digital Library
![Can 10× cheaper, lower-efficiency particulate air filters and box fans complement High-Efficiency Particulate Air (HEPA) purifiers to help control the COVID-19 pandemic? - ScienceDirect Can 10× cheaper, lower-efficiency particulate air filters and box fans complement High-Efficiency Particulate Air (HEPA) purifiers to help control the COVID-19 pandemic? - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S0048969722029813-ga1.jpg)
Can 10× cheaper, lower-efficiency particulate air filters and box fans complement High-Efficiency Particulate Air (HEPA) purifiers to help control the COVID-19 pandemic? - ScienceDirect
![Atmosphere | Free Full-Text | Development of a Method to Determine the Fractional Deposition Efficiency of Full-Scale HVAC and HEPA Filter Cassettes for Nanoparticles ≥3.5 nm Atmosphere | Free Full-Text | Development of a Method to Determine the Fractional Deposition Efficiency of Full-Scale HVAC and HEPA Filter Cassettes for Nanoparticles ≥3.5 nm](https://www.mdpi.com/atmosphere/atmosphere-11-01191/article_deploy/html/images/atmosphere-11-01191-g001.png)
Atmosphere | Free Full-Text | Development of a Method to Determine the Fractional Deposition Efficiency of Full-Scale HVAC and HEPA Filter Cassettes for Nanoparticles ≥3.5 nm
![Amazon.com: PUREBURG 2-Pack Replacement 3-STRAGE High-Efficiency HEPA Filters Compatible with PURITIX Air Purifier HAP260 (small) : Home & Kitchen Amazon.com: PUREBURG 2-Pack Replacement 3-STRAGE High-Efficiency HEPA Filters Compatible with PURITIX Air Purifier HAP260 (small) : Home & Kitchen](https://m.media-amazon.com/images/I/71hE6kY9PtL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: PUREBURG 2-Pack Replacement 3-STRAGE High-Efficiency HEPA Filters Compatible with PURITIX Air Purifier HAP260 (small) : Home & Kitchen
![Amazon.com: MK01 MK06 TZ-K1 True HEPA Replacement Filter, Compatible with AROEVE MK01 MK06, ToLife TZ-K1, POMORON MJ001H, EPI081/EP1081 and Intelabe EPI080/EP1080 Air Purifier, 2 Pack : Home & Kitchen Amazon.com: MK01 MK06 TZ-K1 True HEPA Replacement Filter, Compatible with AROEVE MK01 MK06, ToLife TZ-K1, POMORON MJ001H, EPI081/EP1081 and Intelabe EPI080/EP1080 Air Purifier, 2 Pack : Home & Kitchen](https://m.media-amazon.com/images/I/61LFTZAbIYL._AC_UF1000,1000_QL80_.jpg)