Breakout

The phenomenon known as breakout describes the transmission of sound energy from the interior of the duct out through its walls and into an occupied space. The analysis of the process combines elements of duct attenuation as well as the transmission loss through the duct walls.

Figure 14.9 Duct Silencer Back Pressure Multipliers (Industrial Acoustics Corp., 1989)

Silencers Before and After Elbows

Figure 14.9 Duct Silencer Back Pressure Multipliers (Industrial Acoustics Corp., 1989)

Silencers Before and After Elbows

Downstream

Upstream

Pressure Drop = Rated Pressure Drop x Multiplier Elbows (without turning vanes,) Multiplier L. = D x 3 l_ = D x 2 L = D x 1

Downstream

Upstream

Pressure Drop = Rated Pressure Drop x Multiplier Elbows (without turning vanes,) Multiplier L. = D x 3 l_ = D x 2 L = D x 1

Elbows (with turning vanes)

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