respirator is probably a good idea too no? i always wear one when i break those lines. fridge, ac etc i dont like the idea of breathing that **** either. anything your are unsure of better safe then sorry. a gas shock on a computer chair shot a chunk of plastic at my face when i didnt think before i put the sawsall to it, **** near broke my nose i was bleeding pretty good. another time i was dissembling a lawnmower engine with a hilti sfh-18A (best tool ever btw) again not thinking i wasnt holding the engine i pulled the trigger on the drill to undo a bolt (it puts out 65 ft/lbs) swung the mower around 3-4 times and smashed me in the ankle not related but my point is before you do anything that could be hazordous THINK IT THROUGH