What is CAC and NRC?

An acoustic product with a . 95 NRC rating means that 95% of sound in the space is absorbed, while the other 5% is reflected. Ceiling Attenuation Class (CAC): CAC indicates a suspended acoustic ceiling’s ability to block sound traveling through a plenum when the wall does not extend full height.

What is articulation class?

Articulation Class (AC) – measures how well a ceiling panel prevents sound from reflecting back down to adjacent work spaces in an open-plan environment.

What is ceiling attenuation class?

Ceiling Attenuation Class (Cac): CAC is a measure for rating the performance of a ceiling system as a barrier to airborne sound transmission through a common plenum between adjacent closed spaces such as offices.

What is a good Nic rating?

NIC is used in some building standards, guidelines and rating systems instead of STC because NIC considers all sound paths and better represents what people will experience in the space. NIC values of 35, 40 or 45 are typical in normal applications. NIC ratings are determined according to ASTM E336 standard.

What do you mean by AC in articulation class?

Articulation Class (AC) Articulation Class (AC) – measures how well a ceiling panel prevents from reflecting back down to adjacent work spaces in an open-plan environment.

What are the different types of ceiling acoustics?

Ceiling acoustical performance can be described by at least four different standards, CAC, NRC, STC and AC.

How is the ceiling attenuation class ( CAC ) determined?

CAC (Ceiling Attenuation Class) is a measure of reduction in sound transmission via plenum path between two adjacent rooms, determined in accordance with ASTM e 1414, and plotting decibel reduction (transmission loss) obtained at 16 frequencies against a standard reference curve, in accordance with ASTM e 413.

What does NRC mean for acoustic ceiling tile?

The acoustic ceiling tile NRC rating refers to how much sound the ceiling material can reduce noise by absorbing sound. A higher number indicates more absorption.