Plenum
Box

The Brooke Air Plenum Box is a high-quality galvanised steel chamber designed specifically to complement our range of grilles and diffusers. Each plenum is built to ensure low leakage, stable airflow, and consistent performance across the face of the connected air terminal. By matching the plenum closely to Brooke Air products, we achieve improved pressure stability, better air distribution, and more controlled commissioning on site.

Plenums can be configured with single or multiple spigots, with options for fixed or loose spigots, and a choice of round, square, or oval connections to suit any ductwork arrangement. Designs include straight, stepped, and angled plenums, along with acoustically lined versions where noise reduction is required. Curved plenums are also available to suit curved linear bar grilles, curved slot diffusers, or other non-standard architectural details.

Units can be manufactured with side or top entry spigots, custom heights, bespoke footprint dimensions, and specialist arrangements to suit restricted ceiling voids, bulkheads, or service corridors. Every plenum is made to order ensuring full alignment with the matching Brooke Air terminal device.