Which of the following is NOT a requirement of Feature 80, Sound Reducing Surfaces?
1.Cubical style offices must have partitions that reach 1.2 m (48 inches) and have a minimum NRC of 0.8
2.Conference room ceilings must have an NRC of 0.8 on at least 50% of the surface area
Walls for offices & conference rooms must have an NRC of 0.8 on at least 25% of the surface area
3.Furniture in offices and conference rooms must have an NRC of 0.8 for all systems furniture and seating installed
4.Open office ceilings must have an NRC of 0.9 for the entire surface area"
