Frequently Asked Questions – O2 Canada

Frequently Asked Questions


Orders will ship within 3 business days of purchase.

Hong Kong orders are shipping now and we aim to continue to fulfill new orders as fast as possible. However, due to ongoing shipping delays beyond our control we cannot and expressly do not guarantee any specific delivery date into Hong Kong at this time. You will receive a tracking number once your order has shipped. Place your order now to be among the first in queue. Thank you for your patience.

We are in stock on respirators and orders are shipping within 3 business days. We are no longer in a shipping backlog.

Due to global supply issues, we are temporarily discontinuing the O2 Travel Pouch and Magnetic Clip. This decision helps us deliver our respirators to those in need as soon as possible. These products may rejoin our product line in the future.

Shipping rates vary by region and by weight of the package. Most shipping rates are between $10-$20 USD.

We typically ship with SF Express in Hong Kong.

O2 Curve & COVID-19

Respirators protect the wearer from exposure to airborne particles, and in healthcare, protect from exposure to biological aerosols including viruses and bacteria. Surgical masks are a barrier to splashes, droplets, and biological fluids, and were designed to protect patients from droplets expelled from health care workers. Respirators are designed to seal tight to the face of the wearer. O2 Canada manufactures respirators, and currently we have no plans to manufacture masks, except for use with our respirator products for health care workers.

The National Institute for Occupational Safety and Health (NIOSH) is a branch of the United States Centers for Disease Control and Prevention (CDC), responsible for setting industry standards to prevent workplace injury. The Canadian Centre for Occupational Health and Safety (CCOHS) performs a similar role in Canada, and generally uses the US standards at present.

Respirators remove air contaminants and consist of the designations “N”, “R”, and “P”, which indicate “not resistant to oil”, “resistant to oil”, and “oil proof” respectively. The number indicates the filtration efficiency, and a rating of “95” indicates filtration of at least 95% of particles, “99” indicates filtration of at least 99% of particles, and “100” indicates filtration of at least 99.97% of particles. In testing, the most penetrating particle size is in the 0.3 µm range. N95 respirators (or particulate filtering face-piece respirators) are classified as Class I medical devices in Canada, and Class II medical devices in the United States.

Yes, O2 Canada is a registered Class I Health Canada medical device manufacturer. Our Medical Device Establishment Licence (MDEL) registration is 10455.

Presently, the O2 Curve is not NIOSH N95 certified, and does not claim to be. O2 Canada’s mission is to make clean air available to everyone, including health care workers. We are aware of the global shortage of personal protective equipment (PPE), and therefore it is essential that we provide accurate and transparent information to allow our customers to make informed decisions about our products. The O2 Curve was designed for air pollution, not for clinical care. Although the filter media used in the O2 Curve is capable of filtering ultra-fine particulates at greater than 95% efficiency, part of the N95 certification requires passing three tests that examine valve leakage, breathability, and a sodium load test. In 2018, the O2 Curve was tested at Nelson Labs, and passed the testing for breathability and valve leakage, but due to the compact design of the O2 Curve filter, it may not be compatible with the standard NIOSH N95 testing procedure for sodium load testing, as this required preloading our filters before testing. This process distorted the O2 Curve’s filter and how it is designed to fit with a tight seal inside the respirator. As a result of the COVID-19 pandemic, we have received numerous inquiries asking whether the O2 Curve can be used in clinical applications. We are currently conducting research to determine the compatibility of the O2 Curve with the NIOSH N95 standard. We are actively investigating how to most appropriately test the O2 Curve under these conditions, including inserting the filter material into the O2 Curve prior to the preloading component of the NIOSH N95 test, to minimize distortion and more accurately and appropriately approximate the conditions under which the O2 Curve is used. This testing is ongoing. The research we have to date is described below. We will be continually updating and sharing our research as it becomes available.

Yes, the University of Waterloo Green Energy and Pollution Control Research Laboratory tested the O2 Curve against other commercially available respirators, with particles ranging from 0.5 µm to 4.7 µm. The O2 Curve outperformed the other respirators tested, which included a leading brand disposable N95 respirator, however it is important to note that this study did not specifically include the most penetrating particle size of 0.3 µm in the NIOSH N95 certification, and the testing methodology was not identical to the NIOSH standard. The University of Waterloo study used a flow rate of 32 L / min, which is based on the average work of breathing when doing light physical work. The NIOSH testing standard is 85 L / min, which is based on the average work of breathing when doing heavy physical work, or running at high speed.

The O2 Curve uses a triboelectric charged filtration system, which consists of a hydrophobic outer shell that sandwiches a layer of melt blown filter medium. This filter system works both mechanically and electrostatically, and particles that are too small to be filtered physically are attracted to the charged filter, for improved filter efficiency and performance. The O2 Curve filters are designed to filter with greater than 99% efficiency down to a particle size of 0.1 µm, and independent lab testing confirmed filter efficiency of greater than 99% with particle sizes from 0.1 to 0.5 µm, using a flow rate of 236 L / min.

Many viruses and bacteria are smaller than what any filter can remove. SARS-COV2, the virus responsible for COVID-19, is estimated to be 120 nm (0.12 µm) in size. However, viruses do not typically float in the air on their own, and are instead transported via droplets from sneezing, coughing, and even breathing. These droplets have a wide range in size, but are typically larger. Independent lab testing showed the O2 Curve filter had a virus filtration efficiency of 99.998%, with a mean particle size of 2.7 µm, and used a 31 nm (0.03 µm) virus.

Mask fit testing consists of “qualitative” and “quantitative” testing. Qualitative testing consists of exposing an individual to known detectable chemicals, to determine if the wearer is able to detect those same chemicals while wearing a respirator. Quantitative testing consists of measuring the number of airborne particles on either side of a respirator. Both are tested while wearing a respirator under a series of simulated working conditions.

Yes. Every O2 Curve can be fit tested to an individual user, in the same way that a disposable N95 respirator can. Qualitative testing can be done without any modifications, and for quantitative testing we have developed a shell and filter adaptor that allows individuals to be tested without damaging their own O2 Curve.

The purpose of the mask fit test is to provide an individualized result for a specific wearer. Therefore, not every respirator will fit every face, however the O2 Curve has consistently passed both qualitative and quantitative mask fit testing. Using the TSI PortaCount® 8038 QNFT protocol, the O2 Curve has repeatedly passed with a score of 200+ out of a highest possible score of 200.

We are designing adaptors and protocols to ensure every user can test both mask fit and valve seal every single time they put their O2 Curve respirator on. We are expecting that these will be available soon.

We developed an adaptor to allow placement of a disposable surgical mask over the O2 Curve, to minimize cross contamination. If the disposable surgical mask becomes soiled, it can be replaced, and the O2 Curve’s outer shell can also be wiped down with commercially available disinfection wipes, such as Oxivir® Tb or CaviWipes™, to minimize exposure both to the wearer, and others.

The O2 Curve filters come in a plastic envelope. The side of the filter facing the clear film of the envelope is upstream of the airflow, meaning the side that can be seen through the clear film is the side that should face out and away from the user’s face.

How often you should replace your filter depends on usage and the environment it’s used in. For general use, such as pollution filtration, the filter should last one to two weeks. In very dusty environments, you may need to switch the filter more often. Health measures that work for some people may not necessarily work for others. Different people have different levels of sensitivity, and as such, may require different types of masks to protect against the same type and concentration of substance. A mask improperly used may do little to protect you from any offending substance and may even worsen your exposure in some cases.

For air pollution applications, the O2 Curve filters was recommended to be changed after fourteen (14) days with typical use. We are actively researching how the O2 Curve can be safely used in clinical settings, and we would recommend the filters be changed daily in those conditions, or if the filter is otherwise compromised. We are currently studying extended filter use beyond these recommendations. When the wearer is intending to protect against infectious particles, it is prudent that the filter should be disposed of each time the O2 Curve is used, and that the respirator should be disinfected between uses.

The O2 Max Air filter is 3x more breathable than our regular filter, allowing for 125CFM of airflow. This lighter filter material maintains an efficiency of greater than 99% with particle sizes down to 0.1 µm using a flow rate of 32L/min. Given the lightweight filtration system it is recommended to change your Max Air filter daily to ensure maximum protection.

Due to the severity and unknown risks with regard to infectious diseases, we are recommending that filters be used once and disposed of appropriately. Until we have established a safe and effective sanitation process, we are recommending single use as best practice. However, we are currently studying sterilization methods and protocols for our filters, to determine how the filters can be reused safely, and how many times this can be done before losing filter efficiency.

Yes. The O2 Curve can be sterilized and/or disinfected. The O2 Curve has undergone sterilization certification studies with High Power Labs in the US. The Curve was processed through multiple cycles of both Gravity Steam Sterilization (121 °C for 35 minutes and 15 minutes drying time), as well as STERRAD® 100 NX® vaporized hydrogen peroxide, assessed for any signs of damage or wear, then mask fit tested again (using a new filter) to ensure the Curve was still functioning as intended. The Curve passed again with a mask fit test score of 200+, with the minimum passing score being 100. The O2 Curve has also been tested in single cycle autoclave protocols including the SciCan Bravo™ V21, and the SciCan STATIM® 5000 G4. The O2 Curve has also not demonstrated any appreciable material defects after multiple cleanings with commercially available disinfection wipes, such as Oxivir® Tb or CaviWipes™.

Most masks do not filter particles of the size of the COVID-19 virus, and if they do not seal well to your face, they will allow virus particles to pass around the filter. The O2 Curve’s medical-grade silicone can provide an exceptional seal and our filter material is highly efficient at removing harmful particulate matter. The respirator is submersible and can withstand numerous cleaning methods. We recommend that it is best practice to appropriately discard the O2 Curve filter and sanitize the entire respirator after each use. Wearing any mask or respirator is not sufficient to protect you from infection. Depending on your environment, a respirator is just one of many practices that help protect you against the risk of infection. It is important to wash your hands frequently, avoid touching your eyes, nose and mouth, as well as avoiding close contact with others who may be infected. No mask is capable of protecting you 100% against any other dangerous substance or virus. In particular, COVID-19 is a new virus that is not yet fully understood. We cannot, and we expressly do not, guarantee that our respirators will protect you against COVID-19.

Read Studies & Tests


No mask or respirator is capable of protecting you 100% against any other dangerous substance or virus. In particular, COVID-19 is a new virus that is not yet fully understood. We cannot and we expressly do not claim that our respirators will guarantee protection against COVID-19, and we expressly disclaim any liability of any nature if anyone making us of our products contracts COVID-19 or any other virus or medical condition.

Health measures that work for some people may not necessarily work for others. Different people have different levels of sensitivity, and as such, may require different types of masks to protect against the same type and concentration of substance. A mask improperly used may do little to protect you from any offending substance and may even worsen your exposure in some cases.

Please consult your doctor when deciding whether and how to incorporate an O2 respirator into your health-care routine. Please ensure you always read and follow labels, warnings and directions before using a mask, including, without limitation, cleaning instructions, suggested timelines for disposal and filter change, etc. Content on this site is for reference purposes only and is not intended to substitute for advice given by a physician or other licensed health-care professional. You should not use this information as self-diagnosis or for treating a health problem or disease. Contact your health-care provider immediately if you suspect you have a medical problem.

Nothing on this website should be taken to constitute professional advice or a formal recommendation and we exclude all representations and warranties relating to the use of our products. In no event will O2 be liable for any incidental, indirectly, consequential or special damages of any kind, or any damages whatsoever, including, without limitation, those resulting from the infection of COVID-19 or any other offending substance arising out of or in connection with the use of our products.

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