Product Overview

The STAKKAbox™ Fortress range of network access chamber systems is strong yet lightweight, structural, and scalable, suitable for use within multiple sector applications. The Fortress chamber system has been designed to significantly reduce the costs of network access chamber installations. With its twinwall design and individual sections, the Fortress solution is lightweight, meaning it can be manually lifted and stacked one on top of the other to reach the specified depth required.

Key Benefits

• Strong yet lightweight, structural, and scalable.
• Suitable for use within multiple sector applications.
• Designed to significantly reduce the costs of network access chamber installations.
• Lightweight individual sections can be manually lifted due to twinwall design.
• Significantly faster to install than conventional alternatives, typically taking up to one hour.
• Reduced costs for the installer, requiring no specialist equipment, plant, or box builders.
• Most installations do not require specialist backfills, reducing installation costs.
• Chambers can be adapted to suit on-site conditions with standard tools.
• Allows overbuilding over existing networks and introduction of duct entries for cable entry.
• Enables top-section fine adjustment for flexibility during installation.
• Smooth outer walls with a lip to 'key in' to the backfill, ensuring effective compaction.
• Can be supplied in 'flat pack' format for efficient shipping and flexible delivery/installation.
• All 150mm sections are under 25kg, suitable for a single person lift under manual handling regulations.
• HDPE material outperforms traditional construction methods for chemical resistance, offering a longer install life.

Features & Construction

• Manufactured in nitrogen-foamed High-Density Polyethylene (HDPE), of which up to 90% is recycled material.
• Possesses excellent strength-to-weight properties.
• Twinwall design provides inherent strength.
• Chambers are built by combining four interlocking sidewall pieces to form a 150mm deep chamber ring section.
• Each access chamber possesses vertical and horizontal ribs, resulting in a product that is strong vertically and on the sidewall.

Technical Specifications

STAKKAbox™ Fortress chambers are available in a range of standard sizes. Depths are built by stacking 150mm sections to the desired height. Bespoke options are available upon contact for further details.

Length (mm)	Width (mm)
450	300
600	450
750	600
900	900
1000	1000
1800	675
2000	2000
3000	3000

Installation & Maintenance

• Installation is significantly faster than conventional alternatives, typically taking up to one hour.
• No specialist equipment or plant is required for installation.
• Chambers are adaptable to on-site conditions with standard tools.
• Most installations do not require specialist backfills.
• Ideal for areas imposing wheel loads, such as carriageways and roads open to commercial vehicles.
• Adaptability allows for overbuilding or benching existing network utilities and introducing duct entries.
• Range of accessories enable installers to simply place, connect up tubes or ducts, backfill, and walk away.