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The IO HVAC CONTROLS vd-10-sd is a rectangular auxiliary VAV diffuser designed for integration with variable air volume HVAC systems. Measuring 24 x 24 inches with a 10-inch neck, this diffuser mounts into a standard 2-foot by 2-foot ceiling grid opening and connects to a VAV box or branch duct serving a conditioned space. It is sized for residential applications and is installed by licensed HVAC technicians as part of a zoned or single-zone VAV air distribution system. The rectangular face plate fits flush with drop-ceiling grid systems, providing a clean finish in living spaces and light commercial environments.
This diffuser is suited for residential VAV air distribution installations where a 24 x 24 inch ceiling tile opening and a 10-inch round neck connection are present. It serves as an auxiliary diffuser in systems that require additional or supplemental supply air outlets beyond the primary diffuser. Typical installations include residential rooms, hallways, or open areas that need supplemental airflow from a VAV system. The rectangular form factor integrates cleanly into standard suspended ceiling grids commonly found in residential construction.
Designed as an auxiliary VAV diffuser replacement or new-install component for residential variable air volume systems utilizing a 24 x 24 inch ceiling opening and a 10-inch neck duct connection.
Installation is performed by a licensed HVAC technician. Before installing or removing the diffuser, shut off the air handling unit and ensure airflow to the branch has stopped. The diffuser drops into a standard suspended ceiling grid and connects to the supply duct at the 10-inch neck — confirm duct alignment before securing. Follow all applicable mechanical codes for supply air diffuser placement and clearances.
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