The Lennox Y8498 barometric bypass damper, equivalent to the AprilAire 6110, is a 10-inch round HVAC airflow control device designed to automatically regulate static pressure in forced-air heating and cooling systems. This barometric bypass damper opens and closes based on system pressure, allowing excess air to bypass the supply ductwork when zones close or airflow demand is reduced. By maintaining proper static pressure, it helps protect HVAC equipment, reduce noise, and improve overall system efficiency and comfort.

Commonly used in zoned HVAC systems, the Lennox Y8498 bypass damper requires no electrical connections or controls. Its counterweighted blade design responds mechanically to pressure changes, making it a reliable and low-maintenance solution for both residential and light commercial duct systems. Durable galvanized steel construction ensures long service life and compatibility with standard 10-inch round ducting.

Product Overview
The Lennox Y8498 is an OEM barometric bypass damper that matches the AprilAire 6110 model. It is designed to relieve excess airflow in HVAC systems by automatically diverting air when static pressure exceeds a set level. This helps prevent duct noise, system strain, and airflow imbalance, especially in multi-zone installations.

 

Specifications:

Manufacturer: AprilAire
Lennox Part Number: Y8498
AprilAire Model Number: 6110
Type: Barometric bypass damper
Diameter: 10 inches
Duct Shape: Round
Operation: Pressure-activated, counterweighted blade
Material: Galvanized steel
Power Requirements: None
Application: Zoned HVAC systems, airflow and static pressure control