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We can't give you an answer to your question, at least an honest answer. If you read our web page for this you will see this there;
This product(s) is classified as a Medical Device which is regulated by the FDA. This product may have regulations or restrictions in some states. It is the customer's responsibility to determine and comply with all applicable federal, state or local laws. Having read that it would seem that this is not an item you go run down to the local "Home Depot or Loews".
John, you do know that this is not for structural fire fighting? Any type of "mask" that is being used to cover your mouth is going to cut down on speaking, you will need to yell and yell loud or pull the mask away from your mouth if you need to be heard, then replace it over your mouth. This is unlike the SCBA mask you wear for fire fighting where you can add a voice amp so you can be heard with out removing the mask.
This is what I found on their web site, part number HS-2
New Packaging for the HS-2! We are now including 2 filters with each HS-2 in a whole new packaging!