National Home Inspector Practice Exam 2025 – All-in-One Guide to Master Your Certification!

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What is one function of screened metal chimney caps?

Slowing draft acceleration at the top of the flue

Preventing the escape of sparks and embers

Screened metal chimney caps serve multiple important functions, one of which is to prevent the escape of sparks and embers from the chimney. This is crucial for safety, as sparks that exit the chimney can ignite nearby combustibles, posing a fire hazard. By containing these sparks, the chimney cap helps protect both the property and the surrounding areas, thereby contributing to fire prevention.

While it is true that chimney caps can also help in other areas—such as restricting the entry of birds and other wildlife, reducing rainwater entry, and impacting draft characteristics—preventing the escape of sparks and embers is a primary safety feature that is vital for maintaining the integrity and safety of the entire chimney system. This function directly correlates with fire safety codes and practices, highlighting its importance in chimney design and installation.

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Preventing entry of birds and other animals

Retarding rainwater penetration into the flue

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