iO HVAC Controls HD-1812 18 x 12 Rectangular Two-Position Zone Damper - 2 Wire Actuator, replacement for Honeywell ZD18X12TZ, EWC ND-RSD1812, Zone First ZDS-1812, Braeburn 111812

iO HVAC Controls HD-1812 The HD Series dampers are extruded aluminum parallel blade dampers complete with a 24 volt spring return actuator. The HD Series dampers can be installed in any position and are compatible with most 24V zoning and ventilation controls. They are rated for duct systems less than 1.0Ó WC. These dampers have a simple adjustment for limited position. They are a highly universal option for both zoning an ventilation applications.