Arzel Zoning Technology l80-465 Bypass Damper 10in

Product Description

The ARZEL ZONING TECHNOLOGY l80-465 is a 10-inch round barometric bypass damper designed for zoned HVAC systems. It uses a weighted arm mechanism that opens passively in response to pressure differential, bypassing excess conditioned air when zones close. This eliminates the need for electronic actuators or control wiring on the bypass leg. Licensed HVAC technicians install this damper as part of a zone pressure-relief strategy in residential and light-commercial duct systems. The 10-inch round form factor fits standard round duct configurations and requires no external power source to operate.

The l80-465 is recommended for single-stage heating and cooling applications where the zone sizes are nearly equal. Equal or near-equal zone sizing is critical for proper weighted-arm damper performance, as significant zone imbalance can cause the damper to operate outside its intended pressure range. This damper is suited for residential zoned forced-air systems where a simple, passive bypass solution is preferred over motorized alternatives.

Key Features

• 10-inch round diameter fits standard round bypass duct configurations
• Weighted arm design operates passively without electronic controls or wiring
• No external power required for operation
• Recommended for single-stage systems with nearly equal zone sizes
• Straightforward mechanical design reduces points of failure

Compatibility

Designed as an OEM-style replacement or new-installation bypass damper for 10-inch round duct zoning systems in single-stage residential forced-air applications.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with zoned forced-air system design. Power down the air handler or furnace at the disconnect before cutting into existing ductwork. Ensure the bypass duct run is sized and routed according to the zoning system manufacturer guidelines. The damper must be oriented correctly so the weighted arm swings freely and the blade opens in the intended airflow direction.