Plenum Box with Spigots
An open box folded from one blank with a row of round spigots on its back or a side: the box with every hole marked, and the spigots unrolled. An open box folded from one blank, with a row of round spigots set onto its back or onto a side: the box with every hole marked, and the spigots unrolled.
How the plenum box with spigots is developed, with a worked example · Hoods, plenums and cyclones