Abstract: Means for removing contaminants from an air stream are disclosed that at the same time provides a cost effective apparatus for training firefighters. HOPCALITE is used to remove carbon monoxide while other compositions remove particulates, water and organic vapors, and carbon dioxide.

Abstract: A self-contained emergency respirator that has a mouthpiece that fits into a wearer's mouth and which is directly connected to a chemical canister that processes exhaled breath. The mouthpiece is located within a transparent hood that completely surrounds the head of a wearer and protects the wearer from a possibly toxic environment. A breathing bag encloses the chemical canister and collects the processed exhaled breath for inhalation.

Abstract: A mask is provided with a breathing opening, directly in front of the outer end of which there is a chemical cartridge that is secured to the mask. The cartridge has an exhalation passage extending through it from front to back, with its rear end registering with the breathing opening. A check valve in the inhalation passage allows air flow only into the mask. In the exhalation passage there is a carbon dioxide removing and oxygen generating chemical. A breathing bag is supported by the cartridge and communicates with the front end of the exhalation passage. The mask is provided with an inhalation check valve allowing air being inhaled from the bag to bypass the chemical.