MIRA Safety filters (NBC-77 SOF, VK-450, DOTpro 320) are classified as "combined filters" and contain a P3 filter along with activated carbon. For those that don't know what P3 means, it is a rating for a particle filter that blocks 99.9999%+ of particulates. As viruses travel in liquid aerosols and particulates, this filter (when coupled with a full face respirator) would prevent the Coronavirus from entering your breathing passages and eyes.

Filter use time depends on a few factors, including atmospheric conditions, contaminant type, concentration, along with your breathing rate. As a general rule of thumb, we would suggest having two filters per person per day for emergency evacuation purposes. If you'd like specific data on use time, you can look at the brochure that goes into breakthrough times along with the application.

Typically, it's never recommended to swap filters while you're in the thick of it. We are also selling escape filters, so the goal is for you to get out of the danger zone as fast as possible.

If you ever find yourself in a situation where you'll need to hot-swap filters while in the thick of it, you'll need to get proper training in order to execute the "Mask Clearing & Sealing" procedure safely. We suggest doing independent research on procedures of this level, as these are typically only taught in professional institutions.

For safety reasons, we cannot recommend reusing any filter. This would go against all safety standards set out by regulatory agencies all over the world regarding disposable filters.

If you insist on re-using a filter against COVID-19, it would be best to refer to CDC's guidelines. As new information is constantly being released regarding this virus, it would be best to refer to their updates on how long you'll need to quarantine an exposed filter before you can re-use it.

To calculate the breakthrough time of a specific contaminant, you would use the following formula: T=DAC x 1000/AF x C. T is the approximate usage time in minutes, DAC is the Dynamic Adsorption Capacity (in grams), AF is the airflow (liters per minute) where the default is 30 l/min under normal conditions, and C is the concentration of toxic gas in mg/l. At 5000ppm concentration, and 30 l/min airflow, the breakthrough time is greater than 80 minutes (the EU standard only requires 40 mins).

That depends on a few factors, including the type of contaminants released, concentration, your breathing rate, along with atmospheric conditions. If this explosion released radioactive Methyliodide¹³¹ (commonly released during such events) the European standard is set to a minimum of 2 hours breakthrough time. The NBC-77 SOF exceeds this standard and can be used for more than 2 hours.

The NBC-77 SOF filter is not meant to be fully submerged in water, and we do not have any data to show if it will be effective. However, the installed P3 filter does act as a hydrophobic barrier to heavy rain, decontamination showers, and etc. This filter was specifically designed to prevent water from entering the lateral side (the first point of contact for air traveling into the filter).

Yes, it will, as the installed P3 filter has a special hydrophobic coating, specifically for use with decontamination showers and wet conditions.

No, it does not. You would need a smoke escape filter that contains an oxidizing agent that will help convert CO to CO2, allowing you to breathe it out (click here for the link to the VK-530 Smoke Filter).

Yes, it will, as the Scott gas mask uses a 40mm NATO threaded filter. I would suggest looking at the filter technical specs to see the difference. At first glance, it seems like the NBC-77 SOF is more capable as most contaminant filtration is rated at 5000ppm, whereas the Scott filter is only rated at 1000-1500ppm.

Yes, they will, as all are threaded in the 40mm NATO configuration.

Yes, you would need a new filter every day, but you wouldn't necessarily need a high-end CBRN filter like the NBC-77 SOF.

For viral particulates, experts recommend using a P100 (P3) filter. We have a particulate filter that retails at $150 for 6 pieces (click here for the link to the ParticleMax P3).

Yes, it will, as both are threaded for 40mm NATO.

You can re-seal a filter after it's opened, but we cannot guarantee that it will function the same as a freshly opened unit. As stated in previous Q&As, all figures are for freshly opened filters, as there are many variables that come into play once a filter is opened and/or used.

No, it will not, as the GP-5 uses old 40mm GOST threading.

Yes, it will, as both are threaded for 40mm NATO.

No, it is not compatible as the North mask is not threaded for 40mm NATO filter cartridges.

For viral filtration, you would need a P3 particle filter (all of our filters have a P3 built-in). Since all of our filters are threaded for 40mm NATO, they should all fit the MSA Millenim mask.

This filter will fit any mask so long as the mask is in a 40mm NATO configuration. As the Polish MC-1 is an old gas mask it might be threaded in 40mm Soviet GOST. Make sure to double-check before making a purchase.

Yes, they will, as both are threaded for 40mm NATO.

Yes, they will, as both are 40mm NATO threaded.

There are many cleaning products on the market for gas masks, and each is created for different purposes. As decontamination is a field of study on its own, we would suggest doing independent research and training before purchasing cleaning products. For viral threats, we have heard that Allegro 5003-U is a good product from industry experts. We do not sell it on our website, but you can find it in shops across the web. Filter disposal would depend on local laws for toxic waste disposal. Please check with local authorities as laws differ from county to county, state to state, and country to country.

Precisely. Traditionally, these masks were used by professionals in the EU, along with eastern-European countries. Both the CM-6M and CM-7M are EN 136 CL 3 (special purpose) certified. If you look through and compare NIOSH testing to EN, you will see that EN standards are just as stringent as their NIOSH counterparts. NIOSH does not determine quality by any means, just an extra piece of certification as mandated by OSHA for private sector professional use. Keep in mind, government-owned agencies are not subject to OSHA and can use non-NIOSH masks/filters. This includes police, fire brigades, first responders, etc. All of which are our customers in the US.

As viruses travel in particles and liquid aerosols, this filter will protect you for as long as you can wear the mask (several days). Keep in mind; if you are in a contaminated environment, you would need to decontaminate properly before removing your protective gear, and then dispose of the filter as there is no way to regenerate it. Once the filter is used in a contaminated environment, it is considered toxic waste.