Hitachi FSG1 Series Technical Catalogue page 103

I
RPI - In-the-Ceiling Type (cont.)
Model: RPI-3.0
1.5 Meter Beneath the Unit
Measurement point:
Approximate
threshold of Hearing
for Continuous Noise
Frequency (Cycle per second)
Model: RPI-5.0
1.5 Meter Beneath the Unit
Measurement point:
Approximate
threshold of Hearing
for Continuous Noise
Frequency (Cycle per second)
Power supply: 220V 50 Hz
Noise Criteria Curve
Power supply: 220V 50 Hz
Noise Criteria Curve
CAPACITIES AND SELECTION DATA
Model: RPI-4.0
1.5 Meter Beneath the Unit
Measurement point:
Approximate
threshold of Hearing
for Continuous Noise
Frequency (Cycle per second)
4
/31
Power supply: 220V 50 Hz
Noise Criteria Curve