Roto-Twist® Cable Operated Dampers - Metropolitan Air Technology

Roto-Twist® 150 Series Round Damper
Roto-Twist® 100 Series Rectangular Damper
RT-250 Round Damper

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

Features

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

Downloads

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RT-180 Oval Damper

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

Features

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.

Downloads

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

Features

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

Downloads

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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

Features

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.

RT-WGA Drive

Universal Damper Drive System Features
15 gage galvanized steel housing/mounting bracket, a machined aluminum worm and spur gear, and a steel drive shaft that captures and secures the rotary cable
Pre-assembled at the factory to minimize labor demands at the jobsite
Can be paired with a variety of cable termination fixtures designed to accommodate architectural and functional needs
Gear ratio minimizes torque required to adjust damper and provides necessary adjustment resolution for the balancing technician
Can be used with MAT round and rectangular dampers or dampers by others with shaft sizes up to 3/8” square and 1/2” round
Accommodates round dampers up to 36”diameter and rectangular dampers up to 48” x 48”

RT-CCR

Round Ceiling Cup Features
Paintable self-threading face plate mounts flush to the ceiling and is designed to resemble a sprinkler head cover
Requires less than 1.5 square inches of ceiling penetration
Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
Ships pre-assembled to cable minimizing job site labor demands
No linkage or cable adjustment required during installation
UL 94-V0 flammability rated polystyrene material cup and face plate
Galvanized steel mounting bracket
Zinc plated retaining bar secures cup to the ceiling and captures face plate
1/4” diameter steel rotary cable secured in the ceiling cup with a rubber grommet and a crimped on aluminum ferrule

Additional cable termination fixtures/boxes are available for laboratory environments, tamper proof demands, exposed surface mount needs, diffuser mount applications, and more. Contact MAT or your local sales rep for information on additional systems.

RT-CCM

Miniature Ceiling Cup Features
1″ diameter thin profile paintable ceiling cap suitable for aesthetically demanding spaces
Bracket mounts flush to the ceiling line simplifying installation
Two ceiling cap sizes allow application with ceiling panel thickness from 1/2” to 1 1/4”
Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
Galvannealed steel mounting bracket ships pre-assembled to cable minimizing job site labor demands
No linkage or cable adjustment required during installation
UL 94-V0 flammability rated ceiling cap
Galvannealed steel mounting bracket
1/4” diameter steel rotary cable secured in the mounting bracket using a crimped on aluminum ferrule

Additional cable termination fixtures/boxes are available for laboratory environments, tamper proof demands, exposed surface mount needs, diffuser mount applications, and more. Contact MAT or your local sales rep for information on additional systems.

RT-CCS

Rectangular Ceiling Cup Features
Standard outlet box wall plate design
Standard white face plate (stainless steel optional)
Cable can be terminated in a wall or ceiling location
One piece assembly with no linkage or cable adjustment required during installation
Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
Tamper proof screws available
Water tight surface mount box with stainless steel cover plate & gasket available for laboratory and related applications
Surface mount box available for exposed cable routing
2 3/4″ deep galvanized steel electrical box with flat mounting bracket and top & side knockouts
Screw in connector and rubber grommet for positioning the rotary cable
1/4” diameter steel rotary cable with a crimped aluminum ferrule (to secure the cable inside the box)

Additional cable termination fixtures/boxes are available for laboratory environments, tamper proof demands, exposed surface mount needs, diffuser mount applications, and more. Contact MAT or your local sales rep for information on additional systems.

Downloads

Specs

Submittals

Installation Instructions

Product Description

CAD Details (.DWG)

System Illustrations

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

Features

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.

RT-WGA Drive

Universal Damper Drive System Features
15 gage galvanized steel housing/mounting bracket, a machined aluminum worm and spur gear, and a steel drive shaft that captures and secures the rotary cable
Pre-assembled at the factory to minimize labor demands at the jobsite
Can be paired with a variety of cable termination fixtures designed to accommodate architectural and functional needs
Gear ratio minimizes torque required to adjust damper and provides necessary adjustment resolution for the balancing technician
Can be used with MAT round and rectangular dampers or dampers by others with shaft sizes up to 3/8” square and 1/2” round
Accommodates round dampers up to 36”diameter and rectangular dampers up to 48” x 48”

RT-CCR

Round Ceiling Cup Features
Paintable self-threading face plate mounts flush to the ceiling and is designed to resemble a sprinkler head cover
Requires less than 1.5 square inches of ceiling penetration
Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
Ships pre-assembled to cable minimizing job site labor demands
No linkage or cable adjustment required during installation
UL 94-V0 flammability rated polystyrene material cup and face plate
Galvanized steel mounting bracket
Zinc plated retaining bar secures cup to the ceiling and captures face plate
1/4” diameter steel rotary cable secured in the ceiling cup with a rubber grommet and a crimped on aluminum ferrule

RT-CCM

Miniature Ceiling Cup Features
1″ diameter thin profile paintable ceiling cap suitable for aesthetically demanding spaces
Bracket mounts flush to the ceiling line simplifying installation
Two ceiling cap sizes allow application with ceiling panel thickness from 1/2” to 1 1/4”
Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
Galvannealed steel mounting bracket ships pre-assembled to cable minimizing job site labor demands
No linkage or cable adjustment required during installation
UL 94-V0 flammability rated ceiling cap
Galvannealed steel mounting bracket
1/4” diameter steel rotary cable secured in the mounting bracket using a crimped on aluminum ferrule

Additional cable termination fixtures/boxes are available for laboratory environments, tamper proof demands, exposed surface mount needs, diffuser mount applications, and more. Contact MAT or your local sales rep for information on additional systems.

RT-CCS

Rectangular Ceiling Cup Features
Standard outlet box wall plate design
Standard white face plate (stainless steel optional)
Cable can be terminated in a wall or ceiling location
One piece assembly with no linkage or cable adjustment required during installation
Damper is adjusted via rotary cable actuation using a nut driver or flat head screwdriver.
Tamper proof screws available
Water tight surface mount box with stainless steel cover plate & gasket available for laboratory and related applications
Surface mount box available for exposed cable routing
2 3/4″ deep galvanized steel electrical box with flat mounting bracket and top & side knockouts
Screw in connector and rubber grommet for positioning the rotary cable
1/4” diameter steel rotary cable with a crimped aluminum ferrule (to secure the cable inside the box)

Additional cable termination fixtures/boxes are available for laboratory environments, tamper proof demands, exposed surface mount needs, diffuser mount applications, and more. Contact MAT or your local sales rep for information on additional systems.