Plenum box for Square and Slot Diffusers.
designed to ensure equal distribution of air across the slot diffusers. The supply plenum box has acoustic lining to reduce noise generated inside the duct due to airflow turbulence before reaching the diffuser. The built-in damper can be operated from face of diffuser.
Plenum Box Including Round VD with Mechanism.
Or Just Including round Neck.
All Sizes and acoustic Lining Methods are Available