The Field Controls 8RC is an 8-inch draft regulator designed for oil, wood, and coal-fired heating appliances. This barometric damper ensures consistent draft by counteracting fluctuations in temperature, barometric pressure, and wind, leading to more efficient fuel consumption and stable combustion. Its adjustable design, typically ranging from 0.02" to 0.08" water column, requires p... https://www.partshnc.com/8rc-field-controls-8-draft-regulator-for-oil-wood-coal-01845401