Frequently asked questions

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For any additional questions or feedback, do not hesitate to reach out to us and we will respond within 24 hours.

O2SafeAir, finding your size

Use your index finger and thumb in a “C” shape to measure from middle of nose bridge to just under your chin. Place thumb at blue line below and measure closest size. If you fall between sizes, choose the smaller size.
*For customers who ordered O2SafeAir masks between July – October, when reordering filters choose a size larger than mask size

O2SafeAir - How to find your size
Size inch.
  • XS - 3.2 inch
  • S - 3.5 inch
  • M - 3.9 inch
  • L - 4.7 inch
  • XL - 5.3 inch
Size cm
  • XS - 8.1cm
  • S - 9 cm
  • M - 10 cm
  • L - 12 cm
  • XL - 13.5 cm

O2SafeAir

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Filter test results from Nelson Labs, Utah, USA

  • N95 Nelson test - NaCL particle challenge - Filtration Efficency
  • N95 Nelson test - inhalation and exhalation breathability

External Resources / Studies

Assessing the lifetime of filters is complicated science. At O2TODAY we are constantly looking for ways to improve our products and processes so that you will have peace of mind and the best protection available. Below are helpful links to official studies and recommendations that we use as guidelines that we comply with.

As we continue to evolve and improve our products and seek additional regulatory approvals and certification levels, we will update that information on our website.  

  • Recommended Guidance for Extended Use and Limited Reuse of N95 Filtering Facepiece Respirators in Healthcare Settings
  • NIOSH Guide to the Selection and Use of Particulate Respirators
  • Potential Demand for Respirators and Surgical Masks During a Hypothetical Influenza Pandemic in the United States
  • The Facts About Facemasks

Can't find answers to your questions?

For any additional questions or feedback, do not hesitate to reach out to us and we will respond within 24 hours.

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