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The IO HVAC CONTROLS SD-3208 is a rectangular auxiliary zone damper designed for use in forced-air HVAC zoning systems. Zone dampers control airflow to individual zones within a ducted system, allowing independent temperature management across multiple areas of a building. The SD-3208 is sized at 32 by 8 inches and fits into the ductwork as an auxiliary damper, supplementing or replacing a primary zone control point. Licensed HVAC technicians typically install this component as part of a multi-zone air distribution setup. The unit ships at 8.724 pounds and has an overall footprint of 10 inches wide by 39 inches tall by 8 inches deep.
The SD-3208 auxiliary zone damper is suited for residential and light commercial forced-air systems where duct zoning is required. It fits into rectangular duct runs and connects to a zone control board or thermostat-driven controller to open and close on demand. Typical installations include multi-story homes, additions, or commercial spaces divided into independently conditioned zones. Where the duct layout requires a secondary or bypass damper position, the SD-3208 serves that auxiliary role.
Designed as an OEM-style replacement or new-installation auxiliary zone damper for rectangular duct zoning systems in residential and light commercial forced-air HVAC applications.
Installation should be performed by a licensed HVAC technician familiar with duct zoning systems and low-voltage control wiring. Shut down the air handler or furnace and de-energize the zone control panel before beginning work. The damper must be mounted securely within the duct run and connected to the zone controller per the manufacturer wiring diagram. Follow all applicable local mechanical codes during installation.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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