sk

always

Read the thread that's already been started on this subject

reading the instructions that came with my 3M mask it says that you should change your filter after 40 hours of use, or 30 days. whichever comes sooner. it also says that if you smell fumes or whatever before then, change them. please note: these came with my 6000 series mask. i'm sure other filters have different life spans. but i wanted to post this as an example.

i don't think you have to have a buzz from the toxins to experience health problems. There's less risk if you're in a well ventilated outdoor area, but if you're doing anything inside, or tunnels, or close up to your piece you're inhaling shit that you really don't want to.

unfortunately it seems that there isn't a set period of time that filters go bad after, so like porque said you just have to try and keep them airtight and change them as soon as you notice that you're buzzing or you smell fumes. "Organic vapor filter cartridges stop working when their carbon granules become saturated with solvent. Most respirator users need to replace their cartridges more often than they realize. Also, individuals vary in their ability to smell solvents. If solvent odor is detected inside the mask by the wearer at any time, it means that the filters are saturated or that the fit is inadequate. Train workers to correct this situation immediately." --California Department of Health Services

ouch. thankfully i keep mine in my room.