Used in conjunction with egg-crate ceiling grille and ceiling diffuser grille to connect to ductwork.

Available in sizes up to 600mm square and duct sizes from 100mm to 315mm

Standard box depth for Top Entry is 100mm, standard depth for sid entry is 100mm greater than the spigot size.

Side entry also available for tight spaces.

Unless metal is needed the plastic plenum boxes (Model code PB) are more normally used.