Brother MFC-9450CDN - Manual (Page 231)

Specifications
215
E
Noise level Sound power
Operating (Copying): L
WA d = 6.9 Bell
Standby: L WA d = 4.4 Bell
Sound pressure
Operating (Copying): LpAm = 54.5 dBA
Standby:
LpAm = 30 dBA
Temperature Operating: 50 ° F to 90.5° F (10 to 32.5° C)
Storage: 41 ° F to 95° F (5 to 35° C)
Humidity Operating: 20 to 80% (without condensation)
Storage: 10 to 90% (without condensation)