Open-plan office ceiling diffusers in ASHRAE/NC design practice are most often selected to keep room noise in which framework at design CFM/NC curves?
Choices
- (A) Only STC of partition
- (B) An NC/RC or dBA target in ASHRAE/NC charts using diffuser, duct attenuation, and return sound paths
- (C) Transformer hum only
- (D) Duct A-weighted only, never spatial
Correct answer: (B)
An NC/RC or dBA target in ASHRAE/NC charts using diffuser, duct attenuation, and return sound paths
Explanation
HVAC sound: diffusers+silencers+paths per ASHRAE Applications.