1. The use of ice in the BG-4's cooling system is only required at ambient temperatures above 23 degrees Fahrenheit.

2. The carbon cylinder pressure is full at ________ .

3. When fitting the breathing hose, the connector with the long cuff connects to the connector of the CO₂ absorber.

4. A leaking minimum valve can cause a high dosage problem with the BG-4.

5. When checking constant dosage, the dosage must remain between 1.5 to 1.7 L/min.

6. When checking the minimum valve it must be between ______ and ______ .

7. High pressure O₂ cylinders contain _______ of 99% oxygen.

8. The last low pressure warning occurs when the pressure has dropped to 10 bar, meaning that 90% of the oxygen has now been used.

9. The monitron turns off automatically when pressure drops below 70 liters.

10. When preparing the icepack, the ice receptacles have two different stages of required freezing with a total freeze time of 24 hours.