Grey HDPE preformed access chamber for use on the BT Openreach network as a replacement for brick chambers.

BT4 is a 915 x 445mm x 150mm chamber section. A typical chamber depth (should be specified by a BT Openreach planner) is 750mm. Sections weight 14kg.

The system provides contractors with a means of constructing access chambers quickly and inexpensively, whilst offering improved build quality, reduced defects and enhanced site safety performance.