What is another word for gas helmet?
Pronunciation: [ɡˈas hˈɛlmɪt] (IPA) 
Gas masks or respirators are protective devices worn over the face to filter and purify the air in hazardous environments. These devices go by a variety of synonyms, including gas helmets, breathing apparatus, air masks, chemical respirators, and protective breathing equipment. They are commonly used in industrial settings, by emergency response personnel, and in military applications. The term gas helmet is often used interchangeably with gas mask, although it specifically refers to a mask that covers the entire head, instead of just the face. Other synonyms for gas helmet may include NBC respirator, full-face respirator, or CBRN gas mask.
