ZoneMaster 4-Inch Normally Closed Motorized Damper — Power Open/Spring Close 24V Vent Damper, Stud-Mounted Plug-in Transformer Included (ZC204S)

PRECISION AIRFLOW CONTROL: The Suncourt ZoneMaster Motorized Damper controls airflow in 4" HVAC zoning, fresh air intake, and make-up air applications—improving air quality, comfort, and energy efficiency. The damper is Normally Closed (Power Open), remaining closed when unpowered and opening when powered. ADJUSTABLE CUSTOM AIRFLOW: The 4 inch duct damper features a patented 0°-90° adjustable coupler, allowing fine-tuned airflow control in both powered and unpowered positions. SEAMLESS INTEGRATION: The damper is designed to work with existing zone control systems or operates independently using the included UL-listed 24VAC/20VA stud-mounted plug-in transformer. DURABLE & EASY INSTALLATION: The 24V zone control damper features a simple two-wire installation and a free-wheeling motor coupling to extend motor life. SAFE & RELIABLE: Delivering trusted performance since 1988, Suncourt motorized vent dampers are backed by a 3 year warranty.