Noise Control

PERM
Rectangular Elbow Silencer Packless

The Rectangular Elbow Silencer Packless (PERM) provides a unique solution for noise control applications where fibrous acoustic material is not permitted in the air stream, and where a 90° elbow is necessary due to space constraints. 

The PERM is an ideal solution for undesirable noise in applications where fibrous acoustic material is not permitted in the air stream, such as washdown and high-pollutant areas, including computer rooms, hospitals, cleanrooms and laboratories. The elbow shape of the PERM is ideal for applications with limited space where straight lengths of ductwork are not available. 

  • 90° elbow shape for areas with limited space.
  • Optimized baffle/splitter spacing.
  • No acoustic media.
  • Design flexibility.
  • Optimized performance.
  • Available in 22, 18, 16, and 10 gauge.
  • Accessories available include flanges, slip & drive connections, access doors, transitions and drainage plugs.