What is an effective method of reducing sound when the air handling unit (AHU) is located in a closet?

Using vibration isolators is an effective method of reducing sound when the air handling unit (AHU) is located in a closet because these devices absorb the vibrations that the unit generates during operation. Vibration is a common source of noise in HVAC systems, as equipment can transfer energy to the building structure, causing sound to travel through walls and floors. By isolating these vibrations, the overall noise level can be significantly reduced, leading to a quieter environment.

Vibration isolators are typically made of materials designed to absorb and dampen vibrations, which helps prevent the energy from being transmitted to surrounding surfaces. This is particularly important in close quarters, like a closet, where sound can be more noticeable. While other methods, such as soundproof insulation or sound barriers, may also help reduce noise, they do not address the problem at the source as effectively as vibration isolators do. Mounting the unit on rubber pads can also offer some level of vibration damping, but vibration isolators are specifically designed for this purpose and may provide a greater degree of sound reduction.