Engine 2014: General Subjects

1. A they prevent Freon vapor from saturating the insulation
2. B they hold water vapor on the cold side of the insulation
3. C they reduce the possibility of moisture laden warm air from outside the refrigerated space from entering  the insulation
4. D they reduce the possibility of moisture laden cold air from inside the refrigerated space from entering the insulation

Tip: press A-D to answer