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 North 7506N95 Particulate Filters, Cartridge/Filter, Non-Oil Particulates, N95, Purple (Pack of 10)

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

Product ID: 421890095

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

Description

🛡️ Stay ahead of airborne risks with Honeywell’s sleek N95 filters!

BULK PACK CONVENIENCE - 10 filters per pack to keep you stocked and ready
LIGHTWEIGHT DURABLE - Polypropylene construction ensures comfort without compromise
TRUSTED N 95 PROTECTION - Blocks 95% of non-oil particulates for workplace safety
STREAMLINED LOW PROFILE FIT - Curved top design prevents snagging on pipes or gear
EFFORTLESS SEAL VERIFICATION - Perform quick, reliable user seal checks every time

Honeywell North 7506N95 filters deliver certified N95 particulate protection with a user-friendly seal check system and a low-profile curved design that prevents snagging. Made from durable polypropylene, these lightweight filters come in a convenient 10-pack, ideal for professionals prioritizing safety and efficiency in demanding environments.

Specifications

ASIN	B00Z2RAUC4
Brand	Honeywell
Brand Name	Honeywell
Color	Purple
Colour	Purple
Customer Reviews	4.7 out of 5 stars 307 Reviews
Included Components	Cartridge Respirator Parts & Accessories (10)
Item Dimensions	7.6 x 7.6 x 7.6 centimeters
Item Weight	5 g
Item dimensions L x W x H	7.6 x 7.6 x 7.6 centimeters
Manufacturer	Honeywell
Manufacturer Part Number	7506N95
Material	Polypropylene (PP)
Material Type	Polypropylene (PP)
Model Name	N95
Model Number	068-7506N95
Model name	N95
Number of Layers	1
Size	One Size

Reviews

D**T

Great!

Perfect replacement filters that are no longer available locally

30.07.2025

S**Y

works fine

28.02.2025

S**.

Fits comfo respirator

What I needed. Fits comfo mask. Use to filter out resin while sanding 3d prints

27.12.2022

A**R

great product

work well

11.10.2024

T**T

Does the job

This product added a second layer of protection to my Honeywell face mask. I use it with an Organic Vapor cartridge while spraying pesticides in my yard and did a great job of keeping me safe.

6.08.2020

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