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Warm air rises. The best way to keep it in a tent, cave, or other shelter, is to take care that the upper portion of the shelter does not provide excessive opportunity for warm air to escape. Where practicable with caves or igloos, construct the entrance below the level of the main floor area; that is, tunnel up to the floor. Where a low entrance is impracticable, improvise a door of brush, cloth, or snow blocks sealed at the top, leaving the air opening near the bottom. However, during cooking operations adequate ventilation should be provided especially in impermeable tents for the reasons previously stated. Also, reasonably controlled ventilation from the top of a tent prevents excessive condensation of moisture and is desirable not only during cooking, but also while resting and sleeping if the need for conserving warmth is not imperative. |
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