NCIDQ IDFX Practice Exam

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What does the ceiling attenuation class (CAC) measure?

Sound absorption effectiveness of wall materials
Transmission loss through ceiling tiles between closed rooms
Impact of lighting on workplace productivity
Quality of air circulation in suspended ceilings

The correct answer is: Transmission loss through ceiling tiles between closed rooms

The ceiling attenuation class (CAC) specifically measures the ability of a ceiling system to reduce sound transmission between closed spaces, particularly in relation to noise traveling through the ceiling tiles. This is crucial in designing spaces that require privacy and reduced noise levels, such as offices, conference rooms, and other environments where acoustics are important. A higher CAC rating indicates a more effective ceiling at attenuating sound, thus enhancing the auditory separation between the rooms. Understanding CAC is vital for interior designers and architects as they plan spaces to ensure comfort and functionality. Other metrics, such as sound absorption or the impact of lighting, are relevant but do not pertain to the specific role of CAC in sound transmission.