Breathing circuits connect patients to ventilators for assisted respiration. Used in ICUs and critical care pulmonology units. These circuits deliver oxygen and anesthetic gases safely. Disposable circuits reduce cross-contamination. Made from medical-grade corrugated tubing. Used for short-term and long-term ventilation. Compatible with most ventilators. Essential during mechanical ventilation. Helps maintain proper airflow and pressure. Critical consumable in respiratory support systems.