8 in. Round Automatic Damper. Overview Honeywell Automatic Round Damper power-close, spring-open models ensure low leakage while controlling circulating air in heating, cooling and ventilation systems. Features Features glavanized steel with single-blade damper, which closes off tightly against gasket for minimal leakage Designated as power closed/spring return open damper for use with Honeywell Zoning Systems Can be field-converted when used as an independent zone or for fresh air intake Rated to operate up to 1-inch wc Available in 5- to 10-inch, 12-, 14-, 16-, and 18-inch diameter sizes Product Specifications Application Zone Damper Item Type Product Voltage 24V Size (in.) 8 in. diameter Size (mm) 203 mm diameter Damper Type Single-blade, round Shape Round Motor or Actuator Mounting Side or Top Motor Power closed, spring open, reversible Motor Timing 30 seconds power open/10 seconds spring return Wires to Motor 2 Other Motor Information Range stops