Back Check
Function: The back check controls the door's resistance during the opening process, preventing it from swinging open too quickly or fully, especially in strong winds or high wind pressure scenarios.
Purpose: It provides a gradual stop to the door at a preset opening angle, ensuring safety and preventing damage.
Visualization: Imagine a door that gradually slows down as it reaches a certain angle, stopping smoothly instead of swinging open abruptly.
Delay (Hold-Open/Delay Action)
Function: The delay feature temporarily holds the door open for a specified time after it reaches an open position.
Purpose: It is useful in situations like loading or welcoming, where doors need to stay open momentarily before closing automatically.
Visualization: Picture a door that stays fully open for a few seconds before gently closing, allowing easy passage.