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A contractor is installing suspended acoustical ceiling panels in a new office building. The specifications require the ceiling system to achieve a Class A fire rating as per ASTM E84. Which of the following material properties is primarily assessed by this standard to determine the Class A rating?
- ANoise Reduction Coefficient (NRC)
- BLight Reflectance Value (LRV)
- CCeiling Attenuation Class (CAC)
- DFlame Spread Index (FSI) and Smoke Developed Index (SDI)
Show answer & explanationAnswer & explanation
Correct answer: D. Flame Spread Index (FSI) and Smoke Developed Index (SDI)
ASTM E84, also known as the 'Steiner Tunnel Test,' primarily measures the Flame Spread Index (FSI) and Smoke Developed Index (SDI) of building materials to determine their surface burning characteristics and assign fire ratings like Class A.
Why the other options are wrong
- A. NRC measures sound absorption, not fire performance.
- B. LRV measures light reflection, not fire performance.
- C. CAC measures sound blocking between rooms, not fire performance.
ASTM E84 Class A Fire Rating
A classification indicating a material's surface burning characteristics, specifically its Flame Spread Index (FSI) of 0-25 and Smoke Developed Index (SDI) of 0-450, as determined by the 'Steiner Tunnel Test'.
- Class A is the highest fire rating for surface burning characteristics.
- FSI measures the rate at which flame spreads across a material's surface.
- SDI measures the amount of smoke produced by a burning material.
Memory trick: ASTM E84 means FSI and SDI, for Class A, B, or C.