Which of the following does NOT contribute to effective fire alarm notifications?

Effective fire alarm notifications aim to alert individuals to danger as quickly and clearly as possible, ensuring they can take appropriate action. Bells, horns, and strobe lights are specifically designed to provide loud auditory and bright visual alerts that capture attention. These devices are essential in creating an immediate response to a fire situation, helping to save lives.

Physical barriers, on the other hand, can impede the effectiveness of fire alarm notifications. They may block sound or sightlines, making it difficult for occupants to hear alarms or see strobe lights, which can delay evacuation or emergency responses. Therefore, the absence or presence of physical barriers is not conducive to effective notification, contrasting with the other options that enhance alarm awareness.