BT Inspection Chamber – QuadBox/StakkaBox JMF106 & JMF104
The BT QuadBox/StakkaBox JMF106 & JMF104 is a modular underground access chamber system engineered for modern telecoms and utility network installations. Crafted from high-strength polypropylene, this system offers a lightweight, robust alternative to traditional concrete or brick-built chambers without compromising on structural integrity below ground. Its modular, stackable design allows installers to adjust chamber depths on site, streamlining installation and significantly reducing manual handling requirements during infrastructure projects.
Specifications
| Product type | BT inspection chamber |
| Product range | QuadBox / StakkaBox JMF106 & JMF104 |
| Material | High strength polypropylene |
| Available sizes | 915 x 445 x 150mm, 1310 x 610 x 150mm |
| Product codes | QB915, QB1310 |
| Design | Modular stackable chamber sections |
| Installation | Lightweight modular assembly |
| Application | Telecoms and utility infrastructure access |
Key design features
The QuadBox / StakkaBox system uses modular stackable chamber sections to allow flexible chamber depth configuration on site. Manufactured from polypropylene, the chamber sections are lightweight for easier handling while maintaining durability for underground telecoms installations. Pre-formed duct entry positions also help simplify integration with cable ducting systems during installation.
Benefits
- Lightweight construction reduces handling and installation time.
- Modular design allows flexible chamber depth configuration.
- Suitable for telecoms and utility infrastructure projects.
- Helps reduce reliance on wet trades and heavy lifting equipment.
- Compatible with underground cable ducting installations.
Applications
This BT chamber system provides secure underground access for telecoms, fibre, and utility networks across residential, commercial, and civil infrastructure projects. It is specifically designed to support efficient cable management, reliable inspection access, and straightforward ongoing maintenance.
Explore more
Browse the full range of duct access chambers, chamber covers, and underground ducting systems to complete your installation.
Contact us
For help selecting the correct QuadBox or StakkaBox chamber configuration for your project, contact the team for technical advice and UK wide supply.






