Plenum Boxes (Grille & Diffuser Boxes): Balanced Air Distribution
Plenum boxes (grille and diffuser plenum chambers) are critical HVAC components serving as the vital interface between supply/exhaust duct runs and terminal air diffusion units (linear slot diffusers, swirl diffusers, and grilles). Their primary function is to decelerate incoming high-velocity duct airflow, converting dynamic pressure into uniform static pressure to distribute air evenly and turbulence-free across the entire terminal face.
By stabilizing pressure differentials, a well-engineered plenum box prevents air whistling, dampens aerodynamic regenerated noise, and eliminates indoor draft discomfort to deliver optimal thermal conditions. Fabricated from premium galvanized steel with optional acoustic/thermal lining and integral balancing dampers, they ensure airtight, whisper-quiet, and energy-balanced air distribution in restricted ceiling voids.
Key Features
- Uniform Air Distribution: Converts dynamic velocity pressure into static pressure for balanced, draft-free terminal discharge
- Acoustic & Thermal Insulation: Optional internal elastomeric rubber or acoustic foam lining preventing condensation and noise breakout
- Integrated Balancing Damper: Spigot-mounted manual or perforated adjustment dampers for precise commissioning and airflow balancing
- Versatile Spigot Configurations: Top or side-entry circular spigots with continuous gasketed seams matching rigid or flexible ducting
- Corrosion-Resistant Housing: High-grade galvanized sheet steel construction manufactured with tight mechanical lockseams
- Fast & Tool-Friendly Mounting: Integrated suspension brackets and lightweight architecture allowing rapid ceiling void installation
Application Fields
- Corporate offices, administrative towers, and conference halls (pairing with slot diffusers and swirl anemostats)
- Hotels, auditoriums, sound studios, and environments requiring strict acoustic criteria
- Shopping centers, commercial retail stores, and restaurant dining areas
- Hospitals, medical clinics, clean testing laboratories, and hygienic false-ceiling interfaces
- All ducted fan coil units (FCU), VRF indoor units, and central air handling supply/return plenums
