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MIRA Safety DotPro 320 40mm Gas Mask Filter

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IMPORTANT NOTE: The current batch was manufactured in 10/2020, with an expiration date of 04/2028. This product is currently on clearance and will be discontinued once all units are sold. For that reason, they are offered at a deep discount. 


Combining superior multi-gas protection with a price point that’s tough to beat, our DOTPro 320 respirator filters give you the best bang for your buck when you’re stocking up for yourself, your family, or your organization. Flexible, affordable, and built to last with a 7.5-year shelf life, DOTPro 320 multi-gas filters provide cost-effective protection for known respiratory threats. 

Key Features:

  • 40 mm x 1/7” NATO filter standard (EN 148-1:1999) threading
  • Built to comply with a wide variety of international standards, including EN 14387:2004+А1:2008, EU Health and Safety requirements
  • Practical multi-gas filter that protects the user from toxic industrial chemicals (TICs) and other threats
  • 7.5-year shelf life, with expiration date clearly marked on the filter housing 
  • Easy to deploy and color-coded based on the protection it offers

Flexible and Cost-Effective Protection from Catastrophe 

A gas mask is only as good as the filters attached to it, and here at MIRA Safety, we pride ourselves on offering the very best for every budget—like the flexible DOTPro 320.

This is the best gas mask filter for anyone on a budget or buying for a larger family/group. While our NBC-77 SOF filter still has it beat with a much longer shelf life and broader overall protection, these DOTPro 320 gas mask canisters provide similar levels of protection against a number of common respiratory threats.

That means DOTPro 320 gas mask filters can be just as effective as the premium alternative when facing known threats in a known environment. Engineered to meet strict EU standards and accompanied by relevant filtration data (see below), DOTPro filters are at least equal in “by the numbers” quality to most filters on the market.

Combine that with superior usability, color-coded labeling, clearly marked expiration dates, and rugged construction and you get the best entry-level gas mask filter on the market today.

When it comes to stocking up on gas mask filters, we advise keeping as many good filters on hand as you can comfortably afford. So, even if you’re buying a few high-end NBC-77 SOF filters, it wouldn’t hurt to have a few DOTPro filters for added protection, flexibility, and peace of mind.

NOTE: These gas mask filters are primarily designed to protect the user from toxic industrial chemicals and NOT intended for military or combat usage. 

The initial filter resistance to constant airflow at a volumetric flow rate of 95 dm/min, Pa (millimeter of water column), max. 

DOTpro 320 А2В2Е2К2Р3 R D

– cyclohexane at a concentration of (17.5 ± 1.7) mg/dm3


– hydrogen cyanide at a concentration of (5.6 ± 0.5) mg/dm3


– sulfur hydride at a concentration of (7.1 ± 0.7) mg/dm3


– chlorine at a concentration of (15.0 ± 1.5) mg/dm3


– sulfur dioxide at a concentration of (13.3 ± 1.3) mg/dm3


– ammonia at a concentration of (3.5 ± 0.3) mg/dm3




DOTpro 320 filters should be stored in a cool, dry place away from hazardous substances. The filters should be stored in their original packaging at temperatures from 50°F to 120°F  with maximum humidity of 98%. Storage in conditions other than those specified can affect shelf life. Expiration date is specified on each DOTpro 320 filter. The guaranteed 7.5-year shelf life is for DOTpro 320 filters in the original Sorbent JSC packaging and from the date of manufacture.


Ask a Question
  • Can these filters protect against Asbestos and Mold?

    All of our filters contain a P3 filter which is a high-efficiency ULPA filter (a step above HEPA) that will filter out particles at 99.99995% efficiency. The filtration grade is U16 (U17 is the max). To give you a better idea, the recommended filter rating to protect against asbestos, lead, and cadmium dust is HEPA.

  • Viruses can only survive on surfaces for a period of a few days maximum. So if the only concern is only viruses like the coronavirus (and I don't have to worry at all about exposure to chemicals, etc.), why is it that gas mask filters cannot be reused after a few days, when any viruses that were on/in it will no longer be a danger?

    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.

  • I am looking to use vaporized oxalic acid to treat beehives. I need to be able to block organic vapors along with acid gases. I currently have a M40 military gas mask, which filter will work for this application? Thanks!

    Click here for a link to the DOTpro 320 technical specifications. If you look at the rating for the DOTpro 320 (A2B2E2K2 P3 R D), A2 means organic gases & vapors-boiling point > 65°C at 5000ppm, and E2 means acid gases at 5000ppm. So long as the gases you are exposed to meet the technical description, the filter will work for your application.

  • What are some examples that they protect the user from? Just as tear gas being one example.

    This filter is rated under the European designation A2B2E2K2 P3 R D. To decode this, please read our blog post which details what each letter/number combo means.

  • Will this work With Scott Aviva Half Face Respirator which has NID 40 threads?

    No, they will not, as the Scott Aviva has a different type of 40mm connection port. The keywords you should look for are "EN 148-1 thread" or "40mm NATO".

  • Will the DOTpro 320 fit and seal on a GP5 gas mask with 40mm GOST threads? If so, do you have express shipping in the USA? and what is the limit of units per order?

    It will not fit a GP5 as this filter has different threading (40mm NATO). We do have express shipping that you can choose at checkout, however, all products that are in stock will still have a standard lead time of 3-5 days from the purchase date due to increased demand. There is also no limit as to how many you can purchase.

  • Will these fit a MSA millennium mask?

    Yes they will as they both have 40mm NATO threading.

  • This will work with the Israeli m15 mask right?

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

  • How many hours of consistent use is each of the MIRA P3 rated filters effective for protection against viruses?

    MIRA P3 flters are effective for as long as you can wear the mask, so long as there are no other threats present. Please keep in mind, filters are disposable products and should be discarded after they come in contact with a contaminant.

  • You state in a previous question that "So long as the only threat is viral particles, it will last for as long as you can wear the mask." Does that mean the filter will filter viral particles for a long long time (months/year). Or do you mean as long as you can wear the mask in one sitting?

    This means as long as you can wear the mask in one sitting.

  • As long as I decontaminate the outside of the filter, keep the filter attached to the mask, and cover the intake, how long will the filter be fulfilling its purpose?

    Respirator filters are a disposable product, meant for one single use. For your safety, we do not recommend re-using a filter that's been exposed to contaminants.

  • How long can the filter be used until one should consider it ineffective against a virus? For example, can one install the filter; go out to the supermarket; come home and take off the mask; wash the mask and then when one needs to go out again, assume that the filter will work? Or is this solely effective for one-time use and has to be disposed of as soon as one takes off the mask?

    Filters are only suitable for one use, as they become toxic waste once they come in contact with a contaminant. You can decontaminate the outside of the filter, but you cannot decontaminate or regenerate the inside of the filter.

  • How long does it last in use for viral protection?

    So long as the only threat is viral particles, it will last for as long as you can wear the mask.

  • There is very little information provided to explain exactly what purpose are facilitated by the cartridges you are selling. These things are very expensive. What is the cheapest canister I can purchase to protect against the coronavirus?

    The DOTpro 320 is the cheapest product on our website to protect from the coronavirus. In general, the most affordable option (if you go with a full-face respirator) would be 40mm NATO threaded P3 filters. We will be releasing these very soon on the website, and they will retail for $25/unit. Make sure to subscribe to our newsletter for updates.

  • What's the difference between the DOTpro 320 and NBC-77 SOF filters?

    The DOTpro 320 is a general-purpose ABEK filter with a 7.5-year shelf life, while the NBC-77 SOF is a 20-year shelf life CBRN filter. You can tell them apart by looking at the filter rating (A2B2E2K2...etc), and you will see that the NBC-77 SOF covers more threats than the DOTpro 320. For more information on filter ratings, please review our Gas Mask Buyers Guide.

  • I am aware that a P3 filter is required to block the coronavirus. Which one of your filters is P3?

    MIRA Safety filters (NBC-77 SOF, VK-530, 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.


Customer Reviews
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United States United States

Returning customer

Bought these before, will probably buy more again. Can't beat the price of brand new, unopened filters. Will probably start getting the CBRN filters next.

Eric N. Spear
United States United States

Breath insurance

Bought for Just-In-Case (JIC) scenario and have not used the product which is why I only rated it as 4-star. For me, the security of having these filters on-hand helps just as homeowner's insurance helps. You have them but hope never to have to use them...

United States United States

Russian filters?

Yep, Russian filters. Who knew they were manufacturing NATO filters in Russia? But on the filter, it says 40x1/7. True STANAG filters. Good price, decent shipping time. If I had to nit-pick, the 7.5-year shelf life doesn't take consider the fact that these filters are already 2 years old by the time I got them. In reality, you are looking at a 5-year shelf life. That said, I would still trust these for probably 10 years, maybe 15 if I take care of them. After all, modern filters have an indefinite shelf life. Not infinite, but INDEFINITE. There is no defined date when it is good one day, bad the next. There is only a guarantee that it will work for at least 7.5 years after the manufacture date. 5 stars. Was gonna bring it down to 4 stars due to how much spam email they send out, but they sometimes give you really good offers, so it remains 5 stars.

MIRA Safety MIRA Safety DotPro 320 40mm Gas Mask Filter Review
Thomas H.
United States United States

Gas Mask Filters

Saved them for when I need to use them.

United States United States

Works well

This class two cbrn filters out hypnotic gases completely. I experimented with class ones and they let about 10 percent of it through. Imo if doing anything like biking or walking briskly two are needed to have good flow rates. With one my breathing was labored uncomfortably. 2 does the trick.