Our Quadbox chambers are approved for use on BT Openreach networks and are the only access chambers to be such. This is the smaller of the two chamber size options.This product is one section (the image above shows 4 x JMF104 sections making up the chamber).The first 150mm section is laid on top of a concrete or Type 1 base, with subsequent 150mm sections stacked directly on top of each other until the desired height is reached.These Quadbox sections can be laid over the top of an existing network or old damaged chamber needs to be replaced or enlarged. The sections can be cut to fit around existing networks or obstacles.Duct entry points can be cut using a holesaw. The chamber sections incorporate guides to identify the correct drilling points, ensuring that ducts are correctly spaced.Chamber covers, steps and cable management systems are all available separately to complement this chamber system.