Pendant and upright sprinklers for residential application shall be positioned so that the deflectors are within how many inches from the ceiling?

The correct choice indicates that pendant and upright sprinklers for residential applications should be installed with their deflectors positioned within 1 to 4 inches from the ceiling. This requirement is based on the design and functionality of these sprinklers in a residential setting, which is designed to maximize their effectiveness in fire suppression.

Positioning the deflectors within this range allows for optimal distribution of water in the event of a fire, ensuring that the sprinkler system operates efficiently. If the deflectors are too far from the ceiling, it may impede the proper spray pattern and the coverage area of the water discharge, potentially compromising the system's ability to control or extinguish a fire effectively.

This guideline helps to ensure compliance with fire safety standards and enhances the overall safety of residential structures by ensuring that sprinkler systems are correctly installed for maximum performance.