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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Honeywell 068-7506N95 Particulate Filters, Cartridge/Filter, Non-Oil Particulates, N95, Purple, Pack of 10

Product ID: 77582971

Details

Brand
Honeywell
Color
Purple
Material
Polypropylene
Model Name
7506N95
Size
7.62 cm x 7.62

🌀Low-profile curved design

🎯Easy user seal checks

🛡️N95 filtration efficiency

123.24 DT

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Description

🛡️ Stay ahead of hazards with sleek, reliable N95 defense!

BULK PACK CONVENIENCE - Includes 10 cartridges to keep your team protected without frequent reordering.
EFFORTLESS SEAL CHECKS - Perform quick, reliable user seal checks even with gas and vapor cartridges.
CERTIFIED N 95 PROTECTION - Blocks 95% of non-oil particulates for trusted workplace safety.
TRUSTED HONEYWELL QUALITY - Backed by a 4.6-star rating and industry-leading manufacturing standards.
STREAMLINED LOW PROFILE DESIGN - Curved top prevents snagging on pipes or equipment—stay agile on the job.

The North by Honeywell 7506N95 Particulate Filters offer certified N95 protection against non-oil particulates with a user-friendly design featuring easy seal checks and a low-profile curved top to prevent snagging. Packaged in a convenient 10-count set, these polypropylene filters combine trusted Honeywell quality with practical features ideal for professional safety gear.

Specifications

ASIN	B00Z2RAUC4
Best Sellers Rank	#248,504 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #277 in Respirator Cartridges & Filters
Brand	Honeywell
Brand Name	Honeywell
Color	Purple
Customer Reviews	4.6 out of 5 stars 323 Reviews
Included Components	Cartridge Respirator Parts & Accessories (10)
Item Dimensions	3 x 3 x 3 inches
Item Weight	4.54 g
Item dimensions L x W x H	3 x 3 x 3 inches
Manufacturer	North by Honeywell
Manufacturer Part Number	7506N95
Material	Polypropylene (PP)
Material Type	Polypropylene (PP)
Model Name	7506N95
Model Number	068-7506N95
Number of Layers	1
Size	7.62 cm x 7.62 cm
Unit Count	10 Count

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