A regular dust mask might not be enough to give you 100% sealing, when cleaning your pellet stove burn pot, glass or stove chamber or flue.., you want to stay 100% safe invest in a respirator for cleanings and even filling the hopper.. this is what I use and it works quite well. Stay safe pellet dust can cause respiratory problems down the road..
(broken link removed to http://www.ebay.com/itm/3M-6300-HALF-MASK-RESPIRATOR-WITH-P100-FILTER-CARTRIDGES-SIZE-LARGE-/281236447231)
http://www.ehow.com/facts_6361190_wood-pellet-dust-allergies.html
(broken link removed to http://www.ebay.com/itm/3M-6300-HALF-MASK-RESPIRATOR-WITH-P100-FILTER-CARTRIDGES-SIZE-LARGE-/281236447231)
http://www.ehow.com/facts_6361190_wood-pellet-dust-allergies.html