How Does the Stack Effect Work?

1. Since cold air is more dense warm air, it will always sink while warm air rises.

Stack Effect Step 1

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2. The stack effect occurs when there is a difference in both temperature and pressure between the indoor and outdoor environments. This differential creates a vacuum that draws in the cooler outside air through gaps in the bottom of the home.

Stack Effect Step 2

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3. As the cooler air enters the base of the home, the warmer, less dense air inside has nowhere to go but up.

Stack Effect Step 3

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4. Eventually, the less dense air is forced out through the top of the home, via cracks or holes in the roof.

Stack Effect Step 4

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5. As the warm air leaves, it creates space for more cold air to enter, and thus, a cycle is created.

Stack Effect Step 5

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