ARE Exam Prep: Plenum Box for PPD & PDD | ARE Lab
Автор: ARE Lab
Загружено: 2025-12-16
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A comprehensive explanation of the Plenum Box in HVAC systems, defining it as a small chamber attached directly behind a diffuser, grille, or slot. The primary functions of the plenum box include equalizing and distributing airflow evenly across the output device, which ensures the air throw and spread match design specifications, and reducing system noise by slowing the air velocity and often incorporating sound-absorbing liners. It is highlighted that plenum boxes are nearly essential for linear slot diffusers and also facilitate volume control and easy balancing via attached dampers and spigots. Furthermore, the source differentiates the plenum box from the larger ceiling plenum space, which is sometimes used for return air, and emphasizes that any materials placed in this larger space must be plenum-rated for fire safety.
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