Which parts are contained in the BG4 breathing loop?

The BG4 breathing loop is designed for use in advanced respirator systems, particularly for environments where clean air is crucial. The components mentioned in the correct choice, specifically the carbon dioxide scrubber canister, breathing bag, and air cooler, are fundamental to the operation of the BG4 system.

The carbon dioxide scrubber canister is essential because it absorbs exhaled carbon dioxide, thereby preventing the buildup of this gas within the loop, which could otherwise lead to harmful conditions for the user. The breathing bag serves as a reservoir that stores the air the user breathes, allowing for better regulation and the conservation of breathable gases. The air cooler is included to manage the temperature of the inhaled air, ensuring that it is at a comfortable and safe level for the user, especially in conditions where external temperatures may be extreme.

Together, these components create a closed-loop system that allows for efficient recycling of air while maintaining the necessary conditions for safe breathing, which is especially critical in mining and rescue operations.