• Roto-Twist® 150 Series Round Damper

  • Roto-Twist® 100 Series Rectangular Damper

  • RT-250 Round Damper

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Take-off Duct Balancing Made Simple

The Roto-Twist® series of radial, round, and rectangular cable operated dampers are designed to allow damper adjustment through the face or the diffuser or grille, or from a small access point in the ceiling or wall. The rotary actuation cable is routed from the damper to the room side access point and the cable tip is positioned for easy access. The dampers are adjusted using a nut driver or flat head screwdriver. Dampers ship fully assembled, requiring only three simple steps for installation.

Roto-Twist Cable Operated Damper Systems

RT-150 Radial Damper

RT-180 Oval Damper

RT-100 Rectangular Damper

RT-250 Round Damper

RT-200 Rectangular Damper

  • RT-150 Radial Damper Mounted

  • Direct Cable

  • Expose Cable for Balancing

  • After Balancing

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RT-150 Radial Damper

Inside the air stream – damper adjustment at the face of the diffuser

  • Direct cable to damper connection. Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
  • Cable is routed inside the ductwork and terminated at the diffuser face.
  • No wall or ceiling penetrations are required.
  • Airflow balancing and damper adjustment is performed at the face of the diffuser. After balancing is complete, the cable is recessed behind the diffuser.
  • Available in galvannealed steel in sizes 6″, 8″, 10″ and 12″ flat ovals for Titus, Kruegar and Tuttle & Bailey slot plenums
  • Dampers can be installed in 10 minutes!
  • Ships fully assembled
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RT-180 Oval Damper

Inside the air stream – damper adjustment at the face of the diffuser

  • Direct cable to damper connection. Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
  • Cable is routed inside the ductwork and terminated at the diffuser face.
  • No wall or ceiling penetrations are required.
  • Airflow balancing and damper adjustment is performed at the face of the diffuser. After balancing is complete, the cable is recessed behind the diffuser.
  • Available in galvannealed steel in sizes 6″, 8”, 10” and 12” flat ovals for Titus, Kruegar and Tuttle & Bailey slot plenums.
  • Dampers can be installed in 10 minutes!
  • Easy to assemble, attach the rotary cable and install the damper.

  • RT-100 Rectangular Damper

  • Damper Fabricated in Sections

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RT-100 Rectangular Damper

Inside the air stream – damper adjustment at the face of the diffuser

  • Direct cable to damper connection. Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
  • Cable is routed inside the ductwork and terminated at the diffuser face.
  • No wall or ceiling penetrations are required.
  • Airflow balancing and damper adjustment is performed at the face of the diffuser. After balancing is complete, the cable is recessed behind the diffuser.
  • Aluminum rectangular opposed blade damper is available in sizes from 6 x 4 to 24 x 18 (150mm x 100mm to 600mm x 450mm). Sectional dampers are available for larger sizes
  • Dampers can be installed in 10 minutes! Play the video below.
  • Ships fully assembled
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RT-250 Round Damper System

Outside the air stream – damper adjustment at a small access point in the ceiling or wall

  • One piece cable drive system includes the RT-WGA universal damper drive, rotary actuation cable, and cable termination hardware for positioning the cable at a ceiling or wall access point
  • MAT RT-250 single blade round damper (or damper by others)
  • Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
  • Typical application is for a branch duct or take-off balancing location with cable termination in the ceiling
  • MAT damper sizes 4″ to 20″ (100mm to 500mm)

*If the cable termination options shown in the tabs below will not fit your application, please contact MAT or your local sales rep. Additional designs are available.

  • Mounts to Damper in 2 Easy Steps

RT-200 Rectangular Damper

Outside the air stream – damper adjustment at a small access point in the ceiling or wall

  • One piece cable drive system includes the RT-WGA universal damper drive, rotary actuation cable, and cable termination hardware for positioning the cable at a ceiling or wall access point
  • MAT RT-200 rectangular damper (or damper by others)
    Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
  • Typical application is for a branch duct or take-off balancing location with cable termination in the ceiling.

*If the cable termination options above will not fit your application, please contact MAT or your local sales rep. Additional designs are available.

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