Question 1

for welding the P100/2097 filter is standard are these better? I get throat irritation & coldlike symptoms after welding old steel, galvanized fumes

Accepted Answer

yes  they are.
but as other say, the best thing  is to get some sort of fume extraction going. I built one for less than 100 dollars that pulls 800cfm.
if you are getting symptoms  use amazon to find the bits you need to make a good cheap system to protect yourself .    the growing weed industry means there are lots of functional cheaper fans available and lots of flexible ducting.   i got a fan, and 25' of ducting for about 70 bucks, throw in screws, clips ,vent covers and you are done under $100.... got all of it on amazon... (garage welding )

Question 2

Is there a shelf life to this filter? I intend to buy more and use what's been left.

Accepted Answer

Im sure there is but I dont know it...it last longer 2 or 3x as long as pink 2097 filters..I was using it in weld shop with weld fumes . Grinding particles. And spray paint fumes..I had very clean breathable air. With hardly any sneezing

Question 3

how do you know when it's time for a new filter?

Accepted Answer

I really couldn't tell you, I am still on my first set of these and after absorbing probably 25 hours of welding fumes I can breathe through them almost as good as new. Only difference is they are really brown looking. They still work fine and can't smell any smoke or odors through them. And the fibers inside the center when you take them off the mask is still pure white so nothing is getting through. I looked as I was afraid they had a hole somewhere, I couldn't believe they lasted this long. They are pretty beat up and floppy too and still filter perfectly. Truly marvelous filters!

Question 4

How many are included? Two filters or two sets of two filters == four total?

Accepted Answer

1 set, 2 filters total.  Bostonbrand is wrong.

ASIN	B009POHH94
Best Sellers Rank	#246,284 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #224 in Respirator Cartridges & Filters
Brand	3M
Brand Name	3M
Closure Type	Headband
Customer Reviews	4.8 out of 5 stars 1,884 Reviews
Filter Class	P100
Global Trade Identification Number	00051131171725, 50051131171720
Manufacturer	3M
Material	Thermoplastic
Material Features	organic
Material Type	Thermoplastic
Number of Items	1
Package Quantity	1
Part Number	051131171720
Product Style	full face
Reusability	Reusable
Size	One Size
Special Feature	Reusable
Special Features	Reusable
Style Number	2297
UPC	051131171725

3M 51131171720 Advanced Particulate Filter 2297, P100 Respiratory Protection, with Nuisance Level Organic Vapor Relief Pack of 2

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