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The IO HVAC CONTROLS D-04-PO is a 4" round fresh air damper with a 24V powered open/spring close actuator. This damper features galvanized steel construction and a single blade design. It is ready for installation in any position within a properly sized duct and is rated for duct systems less than 1.0" WC. Available in POSC or PCSO configuration.
The D-04-PO is a 4" round, 24V fresh air damper suitable for residential HVAC systems. It's designed for easy installation and reliable performance in zoning and ventilation applications.
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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