to tack on to what Frisket said about the 3M mask... I purchased a new surplus Israeli mask and filter about a year ago... new old stock but had an 82 manufacture date...almost 30 years old... be careful about buying surplus...the rubber was in excellent condition, and if I can find a current filter would probably be ok... I think the 3M mask would be the better idea.. possibly use with a SCUBA face plate and mil surplus Nomex balaclava, or one for use as part of a flame suit for race cars... I'm not sure if the hood with the military chemical suits is fireproof or not... after my time