Io Hvac Controls BN-12-SD Auxiliary Vav Diffuser 12 Inch Neck

Product Description

The IO HVAC CONTROLS BN-12-SD is a 2-foot by 2-foot auxiliary variable air volume (VAV) diffuser designed for ceiling-mounted supply air distribution in commercial HVAC systems. It features a 12-inch neck connection and communicates over BACnet, allowing integration with building automation systems (BAS) for direct digital control of airflow. At 10.8 pounds, the unit is sized for standard 2-foot by 2-foot lay-in ceiling grids. HVAC controls technicians and mechanical contractors install this diffuser where zone-level airflow modulation and network communication are both required.

The BN-12-SD is suited for commercial and light-industrial VAV applications where BACnet protocol compatibility is a system requirement. It installs in suspended T-bar ceiling grids as part of a VAV zoning strategy, replacing conventional static diffusers to enable demand-based airflow control. The 12-inch neck allows connection to standard round ductwork of that diameter. This unit is appropriate for retrofit and new-construction projects that require networked diffuser control without a separate VAV box.

Key Features

• BACnet communication protocol for direct integration with building automation systems
• 12-inch neck diameter for connection to standard round supply ductwork
• Fits standard 2-foot by 2-foot lay-in ceiling grid openings
• Auxiliary VAV diffuser design combines air distribution and volume control in one unit
• Compact depth of 25.25 inches accommodates typical above-ceiling plenum clearances

Compatibility

Designed as an OEM-style VAV diffuser for commercial HVAC systems using BACnet-based building automation and 2-foot by 2-foot lay-in ceiling grid installations with 12-inch round duct connections.

Installation Notes

Installation should be performed by a licensed HVAC technician or mechanical contractor familiar with VAV systems and BACnet network commissioning. Shut down the air handling unit and de-energize all associated controls before beginning installation or wiring work. Verify ceiling grid structural support is adequate for the 10.8-pound unit before securing. BACnet address configuration and network integration should be completed per the system integrator's sequence of operations and applicable ASHRAE guidelines.