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.

Brand	3M
Manufacturer	3M
Country of Origin	USA
Model number	2297
Number of Memory Sticks	1
Special Feature	Reusable
Item Weight	18 g
Product Dimensions	17.78 x 12.7 x 1.27 cm; 18 g
Item model number	2297
Item Height	0.5 Inches
Item Width	5 Inches
Power Source	Corded
Are batteries included?	No

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

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