Brother MFC-9970CDW Basic User's Manual page 202

Noise level
1
Measured in accordance with ISO 9296.
Temperature
Humidity
ADF (automatic document
feeder)
194
1
Sound power
Operating
(Colour Copying):
Operating
(Monochrome Copying):
Office equipment with L
room where people do primarily intellectual work. Such equipment
should be placed in separate rooms because of the noise
emission.
Ready:
Sound pressure
Operating (Printing):
Ready:
Operating: 10 to 32.5°C
Storage: 0 to 40°C
Operating: 20 to 80% (without condensation)
Storage: 10 to 90% (without condensation)
Up to 50 pages (Staggered) [80 gsm]
L d = 6.70 B (A)
WA
L d = 6.67 B (A)
WA
d > 6.30 B (A) is not suitable for use in
WA
L d = 4.21 B (A)
WA
L m = 57 dB (A)
PA
L m = 33 dB (A)
PA