Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
The sound generated by a fan depends on the motor power, the volume capacity, the static pressure increase and the discharged volume.
The transmission of outdoor sound through and around barriers - the Fresnel Number.
In a room the sound or noise will reach the receiver as direct and reverberant sound.
Doubling of the distance from a noise source reduces the sound pressure level with 6 decibel.
Sound transmission and attenuation in building elements like massive concrete walls or floors.
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