PBG
Plenum box for small rectangular or square grilles
                - Low-Line/High-Line
 - For all Exhaust Grilles GC5 / PER / 3 Series
 - Up to 4 connections, Side/Top Entry spigot, Circular/Flat Oval/Rectangular
 - Options – 6mm acoustic lining (optional) reaction to fire class C-s3-d0 to EN 13501-1: 200
 
The proprietary plenum boxes for Grilles constitute an easy and cost-effective way to connect the grilles back to ductwork.