Round damper, 12-inch, with 24-volt, spring return damper motor used to control volume of circulating air in heating, cooling, and ventilating systems. Galvanized steel, single-blade damper. Shipped as power closed/spring return open damper, for use with Honeywell Zoning Systems. Can be field-converted to power open/spring return closed damper when used as an independent zone or for fresh air intake. Blade closes off tightly against gasket for minimal leakage. Rated to operate up to 1 inch water column (wc). Honeywell automatic round damper power-close, spring-open models ensure low leakage while controlling circulating air in heating, cooling and ventilation systems. Galvanized 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 water column (wc). Available in 5- to 10-inch, 12-inch, 14-inch, 16-inch, and 18-inch diameter sizes.