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What does an APF of 50 mean?

An Air Passage Factor, or APF, of 50 indicates that the air passage in a specific space is basically impenetrable. The APF is a measure of the air passage capacity through an opening or a portal and is expressed as a numerical value. A lower APF value indicates a greater air passage capacity, while a …

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How far north will alligators go?

Alligators are a subtropical species and are not able to survive in extremely cold climates. Generally, alligators will only be found in the southern United States, as far north as coastal North Carolina and some parts of Arkansas, and the very southern region of Alabama. Alligators have been sighted as far north as North Carolina’s …

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