What factor alters the installation requirements of smoke detectors in slanted areas?

The angle of the slope is crucial in determining the installation requirements of smoke detectors in slanted areas because smoke rises and collects at the highest point in a room. When a ceiling is slanted, the angle can affect how smoke travels and accumulates, thus influencing the positioning and height at which smoke detectors should be mounted.

In sloped ceilings, the installation guidelines often require that smoke detectors be placed at certain distances from the apex or peak of the slope to ensure effective detection. If the slope is too steep, its angle can cause smoke to bypass the detector, leading to delayed activation in the event of a fire. This is why adhering to the correct angle for mounting smoke detectors is essential for optimal performance and safety in slanted areas.