What is plenum box?

Its an air collecting box. And it is used for clubbing two units together or reducing the sound level of air flow

Eng'r. Mostafa Al Wakeel

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Plenum boxes provide the connection between grilles and diffusers, and the appropriate ductwork either extracting or supplying air. Essentially plenum boxes are just as important as both the grille and ducting.

Fixing lugs for fitting into a drop rod ceiling can be factory fitted, and normally the plenum will be fixed by an appropriate method to the grille or diffuser neck.

plenum chamber An enclosed space in which a plenum condition exists; air is forced into it for slow distribution through ducts.