All orders ship for free to to anywhere in the U.S., including Alaska, Hawaii, and Puerto Pico.



We ship to 175 countries around the world with shipping insurance available via Route to make sure your package is protected.



Have questions or need help with an existing order? You can either click the chat bubble below, call us to chat with an expert, or email us.

MIRA Safety DotPro 320 40mm Gas Mask Filter

26 reviews
Shipping calculated at checkout.
Quantity must be 1 or more
Regular price
Sale price

Shop with Confidence

1 year factory warranty

5 years on select products

Free shipping for

all U.S. orders

Got a question before you order?

Call us at 888-316-1462



Combining the same practical protection of our premium filters 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 shelf life of 7.5 years, DOTPro 320 NBC filters may provide exactly the kind of protection you’re looking for. 


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
  • Full Spectrum protection from NBC/ABEK threats
  • 7.5 year shelf life, expiration date clearly marked on 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 at every budget point—like the flexible DOTPro 320.

This is the best gas mask filter for anyone on a budget or anyone who’s buying for a larger family/group. While our NBC-77 SOF filter still has it beat with a much longer shelf life, these DOTPro 320 gas mask canisters still provide outstanding performance and value that beats most competitors on the market today.

DOTPro 320 gas mask filters are designed to overcome a wide variety of chemical, nuclear, and biological threats—which they’re proven to do extremely well. Engineered to meet strict EU standards and accompanied by relevent filtration data (see below), DOTPro filters are at least equal in “by the numbers” quality to most filters on the market today.

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 add a few DOTPro filters for added protection, flexibility and peace of mind.


The initial filter resistance to constant air flow at 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 s specified on each DOTpro 320 filter. The guaranteed shelf life of DOTpro 320 filters in the original package of Sorbent JSC from the date of manufacture is 7.5 years.


Ask a Question
  • 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-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.

  • 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.

  • What is the manufacture date on the dot pro 320 that will be shipped, if bought.

    We receive shipments for the DOTpro 320 filters every month, so typically the manufacturing date is the month before. At most, they are two months old.

  • 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.


Customer Reviews
4.9 Based on 26 Reviews
5 ?
4 ?
3 ?
2 ?
1 ?
Customer Photos
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
Charlie N.
United States United States
Gas mask

Love it works great and is comfortable to wear

Steven C.
Canada Canada
DotPro 320 40mm Gas Mask Filter

It is ok. A bit expensive, works well, fits ok, I think for the filter that it is, I hope it works with CS gas and light nerve as that is what I’ll be into if *** hits the fan

United States United States
Good product

No issues. Work great

Forrest H.
United States United States
Yeah Good stuff

What it’s supposed to be And economical Thanks

Paul s.
United States United States
MIRA Safety DotPro 320 40mm Gas Mask Filter

Shipping was fast. Products looked great and as advertised. Hopefully i won't have to use them any time soon. Thanks for doing what you folks are doing. Helping "we the people" to be prepared . God bless all of you at Mira and elsewhere.