Noise

2.3 Noise
Noise from the equipment, ducts, or air outlets is an important part of the comfort equation. The
placement of the equipment within the conditioned space will increase energy efficiency;
however, the placement of the equipment must consider the impact of the equipment noise
during operation. Placing equipment close to important noise control areas such as bedrooms
must involve consideration of the implications from the equipment noise and vibrations.
The placement of the return air inlet can also have an impact on system noise. A return duct that
has a direct connection to the blower motor, as shown in Figure 7, will transfer that blower noise
to the occupied space. One way to overcome this issue is by adding radius elbows in the return
duct to help isolate the blower noise from the space, as shown in Figure 8