Copyright RetroZone inc.2020 

RZMMB Damper


24 Volt Spring Return Mid-Torque Multi-Blade Damper



The DuroZone Multi-Blade damper for residential zoning systems has been engineered to include many features. Ribbed for strength and extruded from lightweight aluminum, the sleek frame profile provides maximum strength without excessive reduction of free area inside the ductwork. The extruded aluminum blades are mounted with friction minimizing nylon bushings to provide easy transition between opening and closing.The DuroZone Spring Return Multi-Blade Dampers also feature damper blades designed to remain within the damper frame for easy insertion and an external side-mounted linkage for smooth and quiet operation. Multi-Blade dampers are available in 74 stock sizes with a 24-volt spring return “Mid-Torque” motor.



    Designed for zoning warm air, air conditioning systems and fresh air intake; Spring return open operation only, power close.

    The exterior side mounted linkage ensures quiet operation and a smooth in-duct air flow.

    The blades are mounted with friction minimizing nylon bushings.

     Extruded aluminum frame and blades make for a very strong yet lightweight damper.

     Parallel blade operation.

    Gasketing included for high integrity seal.

     24 volt mid-torque motor already installed on damper.

     Available in 6" x 8" to 12" x 24"; both side and bottom motor mount configurations available.

     Custom sizes also available on request.

     Damper and motor guaranteed for 3 years.


These dampers Require a 5 day build time.


Note: If you are using this damper connected to a zoning system board, you will want Power close/Spring open (Normally Open), If you are using damper tied directly to a thermostat, you will want a Power open/Spring close (Normally Closed).  Indicate if you want your motor mounted on the short side or long side.  If you have any questions, please give us a call at 972-633-8104.



                  Size A                  Size B                Size C                 Size D                Size E


        $139.24                     $150.85                  $164.52                      $174.47                     $192.30


            8x6                       10x10                         12x12                         14x14                      14x8 

            8x8                        12x8                           14x10                         16x12                      16x16

          10x6                        12x10                         14x12                         16x14                      16x18

          10x8                        14x8                           16x10                         18x10                      18x14

          12x6                        16x6                           18x8                           18x12                      18x16

          14x6                        16x8                            20x6                          20x10                      20x12

                                          18x6                            20x8                          22x8                        20x14

                                          20x6                            22x10                        24x8                        22x12 





Size A and B    Small

Size C and D    Medium

Size E Large


These dampers include FREE  DOMESTIC SHIPPING!

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