Roth Blower Silencer Overview
Primarily suited for reducing intake noise in Roots series blowers, also applicable for noise reduction in exhaust ducts and other high-pressure fans. Noise reduction of 15-30 dB(A), pressure loss less than 500 Pa.
Roto-Blower Muffler Specifications and Models

Section 3: Selection of Roots Blower Mufflers
1: Flow, pressure.
2: Interface dimensions.
3: Installation on import or export, includes rain hat?