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10" Round Retro Damper The Retro Damper™ is the easiest and least expensive way to zone an existing home or building. With traditional round zone dampers, it is required that a section of the existing ductwork be removed and the damper be installed in this section. With the Retro Damper™, a small 1” slot cut into the existing ductwork is all that is required. Then it is simply fastened to the ductwork with four zip screws. Installation is that simple! Another benefit to the Retro Damper™ is its actuator. It uses a high torque, low power actuator. This allows up to 20 dampers to be wired directly to the zone control panel (no additional relays or transformers required). Installation is that simple! And because the high-quality Retro Damper™ is low cost, almost any home or building can now be zoned easily and cost effectively. It is that simple!