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Bigger cap for 18mm/22mm HEPA filters

Bigger cap for 18mm/22mm HEPA filters

thingiverse

Bigger caps are needed for 22mm and 18mm HEPA filters. For example, the Electrolux EFS1W has an 18mm diameter. You can find a mask design that fits your needs at https://www.thingiverse.com/thing:4225667. To see how well HEPA filters work against submicron particles, check out this NASA study: https://ntrs.nasa.gov/search.jsp?R=20170005166. I removed the internal grid from the original mask design since it's already included by the author.

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