Lennox MMA048S4

15
3. Noise Criterion Curves
Figure 8. Noise Measurement - Concealed Duct
Sound is measured 4.92 ft (1.5m) away from the center of the air handler. Data is valid and gathered in free eld and
nominal operation conditions. The sound level will vary based on where the unit is installed.
6.56ft (2m)
3.28ft (1m)
4.92ft (1.5m)
Air Handler
Acoustic pressure OdB = 20μPa
MMA018
MMA024