ZC208 8" normally closed adjustable damper

Suncourt ZoneMaster Fully Adjustable Motorized Airflow Control Zone Damper Air Duct Fan (8 inch), Usually Closed, 24 Volt Thermostat Compatibility, 24VAC/20VA Plug-in Transformer Included, Silver

Suncourt ZoneMaster Fully Adjustable Motorized Airflow Control Zone Damper Air Duct Fan (8 inch), Usually Open, 24 Volt Thermostat Compatibility, 24VAC/20VA Plug-in Transformer Included, Silver