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What is a "Dogging Cylinder" used for?

  1. To unlock a main entrance

  2. To dog an exit device

  3. To create a duplicate key

  4. To reinforce door security

The correct answer is: To dog an exit device

A dogging cylinder is specifically designed for use with exit devices, which are commonly found on commercial doors. By dogging an exit device, the door can be kept in an unlocked or open position, allowing for ease of access through high-traffic areas while still providing the ability to secure the door when needed. This feature is particularly useful in emergency situations or during busy hours when it’s crucial to allow continuous flow of people without constantly needing to unlock the door. The other options mentioned represent different functions that do not align with the unique purpose of a dogging cylinder. For example, unlocking a main entrance typically involves a different type of locking mechanism. Creating a duplicate key would involve key cutting processes unrelated to exit devices. Reinforcing door security pertains to physical changes or upgrades to the door's structure or locking system rather than the specific operational function of a dogging cylinder.