Articles tagged “NR”
4 articles covering NR in acoustic engineering and building design.
What is a Background Noise Survey?
A background noise survey measures ambient noise levels in octave bands to assess compliance with NC, NR, or RC criteria. Learn methodology, equipment, standards, and how results affect acoustic design.
What is HVAC Noise? Controlling Mechanical System Sound in Buildings
HVAC noise is unwanted sound from heating, ventilation, and air conditioning systems. Learn noise generation mechanisms, NC/NR criteria, duct attenuation, and practical control strategies.
What is Noise? (Wanted vs Unwanted Sound)
Noise is unwanted sound that interferes with communication, concentration, or comfort. Learn how noise is measured, classified, and controlled in building acoustic design.
What is an NR Rating?
NR (Noise Rating) is the European octave-band system for specifying acceptable background noise in buildings. Learn how NR curves work, how they compare to NC, and NR targets by room type.