Plenum boxes
A plenum box is an essential component in HVAC air distribution systems, typically used in conjunction with diffusers, grilles, or registers. It serves as an enclosed chamber that helps equalize air pressure and volume before air is discharged into a conditioned space or returned to the main ductwork. This crucial function ensures uniform and stable airflow, preventing drafts and optimizing system efficiency. Plenum boxes are commonly made from galvanized steel, but can also be constructed from other materials like aluminum or even insulated ductboard. They connect the main duct run to the air outlet device, often featuring internal baffles or acoustic lining to reduce noise and enhance air mixing. Their design minimizes air turbulence, allowing air to spread evenly across the diffuser's face, thereby improving both thermal comfort and system performance. These components are vital for achieving balanced air distribution in commercial and residential HVAC installations. By providing a controlled transition point for airflow, plenum boxes contribute significantly to the overall effectiveness, quiet operation, and energy efficiency of the ventilation system.