Working in covid icu 3-4 days a week (36-48 hours), i would like to know how frequent the filters are to be changed?

Mickey, Thanks for your question. Please read the full reply as there is important information throughout. If only considering breathing quality, a weekly change out would normally be fine. This is because filters over time "load" up with particulates (not just Covid, but anything) which in turn generates back pressure that causes breathing to feel labored. This process can take days (or even weeks) depending on how much the filter is used and the environment. However, because of the intensive exposure to surface contaminates in an ICU ward, which will coat the exterior surfaces of the mask and filter, I strongly recommend modifying the above schedule to replace the filter whenever the mask itself is cleaned and sterilized. In any case, do _not_ wash the filter. It's electrostatically charged to filter aerosolized particulates like Covid-19 and washing neutralizes that charge.

I use this in my Oura mask - how many hours before changing?

About a week, assuming 1-3 hours a day of regular daily use. Like all N95 filters, these are electrically charged. That charge begins to dissipate when the filters are regularly exposed to air (and moisture in the air).

Will this fit into the oura air mask?

Yes, I use these in all of mine and my kiddos Oura masks

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BULK VALUE - Pack of 10 ensures you're always prepared.
VERSATILE PROTECTION - Ideal for non-oil particulates in various environments.
EFFORTLESS SEAL CHECKS - Quick user seal checks for peace of mind.
BREATHE EASY BREATHE SAFE - Experience unparalleled filtration with N95 technology.
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The North by Honeywell 7506N95 Particulate Filters provide reliable N95 protection against non-oil particulates. With a user-friendly design for easy seal checks and a low-profile shape, these filters ensure comfort and functionality. Each pack contains 10 filters, making it a practical choice for those who prioritize safety and convenience.

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