Mitsubishi Electronics LGH-F-RX3-E Ventilation Hood User Manual


  Open as PDF
of 36
 
LGH-F-RX3-E (Feb. 2009)
LGH-F-RX3-E
Performance Certied
to ARI 1060 Standard
ERV-18
The human ear senses differently according to frequency. However, sound generated from a vibration is not limited to one frequency but in-
stead various frequencies are generated at different levels. This is expressed by the NC curve, which is determined according to the difculty
of hearing a conversation. Even if the sound is a very low level, it is annoying if a specic frequency is emitted.These sounds are suppressed
to a minimum during product design stages, but the sound may become very disturbing with resonance of the ceiling, wall, etc.
Room application
dB
NC value Room application
dB
NC value
Example Continuous frequency analysis NC curve
Tolerable noise levels and NC values according to room application
Sound Pressure Level (dB)
5. SOUND ANALYSIS
5.2. LGH-F-RX3-E NC Curves
LGH-F300RX
3
LGH-F470RX
3
LGH-F600RX
3
: Lossnay
®
ventilation : Lossnay
®
ventilation
: Lossnay
®
ventilation : Lossnay
®
ventilation
: Lossnay
®
ventilation: Lossnay
®
ventilation
5 ft. below
5 ft. below
5 ft. below
5 ft. below
5 ft. below
5 ft. below
5.1. Sound Analysis
 previous next