Field Controls 46486901 4-Inch Vent Damper Without Harness

The Field Controls 46486901 is a 4-inch automatic vent damper designed to improve heating system efficiency by preventing heat loss through the vent when the appliance is not operating. This damper closes automatically when the heating unit shuts off, blocking the escape of conditioned air up the chimney and preventing cold outside air from entering the home through the flue.

Key Features:

• 4-inch diameter fits standard residential flue pipes
• Automatic operation—opens when appliance fires, closes when off
• Reduces standby heat loss and improves overall system efficiency
• Helps prevent drafts and backdrafts when heating system is idle
• Sold without electrical harness (harness purchased separately)
• Designed for use with gas-fired heating appliances

This vent damper is ideal for retrofit applications on existing heating systems or new installations where improved energy efficiency is desired. The GVD-4 model is engineered for reliable, long-term performance in residential HVAC applications.