ZONEMASTER ZONE CONTROL DAMPERS Control Airflow To Individual Rooms The ZoneMasterTM Zone Control Damper saves money on heating and cooling by controlling temperatures in individual rooms. • Available in 6", 8", 10" & 12" diameters. • Safe, low voltage stud mount transformer and motor • Tremendous energy saver • Free-wheeling coupling between motor and damper shaft for long life • Housing length is 8" • 3 year limited warranty Includes 24v-120v transformer