Copy Right RetroZone inc.2020

 Durozone by Durodyne(tm)  DRD Residential Round Series Mechanical Dampers.  3 wire power open/power close operation

starting at 80.29
With Free Domestic Shipping

Three wire, power open, power close damper draws power only when opening or closing, unlike spring return dampers.  Use on all zone control applications, works on almost any brand of 24vac zone control panel using two position dampers.  


Heavy gauge steel with easy to replace 24VAC motor.   


Unlike most 3 wire dampers, the Durozone  DRD dampers can be used as a slave zone damper (connected directly to a thermostat) without the use of a relay. Requires 3 wires for operation.  This is an outstanding choice compared to 2 wire spring return dampers that must pull power, when energized, to overcome the spring.  “Normally open or close” does not apply to these dampers since no spring is involved-dampers use power only when moving. 


*Power open, power close, no spring!

*Also see our SD series 3 wire dampers. 

*Uses power only when moving

*quality construction, 5 year warranty.

*24vac low voltage, low power, intermittent operation

*15 second open close times. 

*Full open or close operation only. 

*3 wires to damper needed for operation

*Can be driven directly from thermostat without relay. 

*Compatible with almost any zone control system using 2 position dampers.

PLEASE NOTE:  These dampers are manufactured without polyurethane seals.  Seals can be provided upon request for customer installation.  Please put this in “notes” when you order. 

Available Sizes:4" to 10",12", 14", 16", and 18" diameter

DRD Small 4", 5",6" & 7"

DRD Medium 8", 9" & 10"

DRD Large 12", 14", & 16"

DRD X-Large 18"



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