Round Motorized Damper, 8 in Height (In.), For Use With EMM-3UK, Mfr. No. EMM-3K, TZ-4K This listing is for each. Technical Specification Item Round Motorized Damper Dia. (In.) 6 in Voltage (AC) 24 Height (In.) 8 in Output Amps 6 VA Connection 2 Wires Application Controls Air Flow In Heating And Cooling Systems For Use With EMM-3UK, Mfr. No. EMM-3K, TZ-4K