QuadBox®JMF
A robust segmental system
QuadBox® JMF is a robust preformed underground access chamber system for use in many buried networks and utilities. QuadBox® JMF system comprises 150mm sections which are stackable allowing variable chamber depths.
QuadBox® JMF is available in 5 sizes including Footway 2, 4 and 6 and is Openreach approved. It is suitable for congested networks.

Trusted & Proven
QuadBox® JMF is the original Openreach approved chamber and has been on the market since 2004, with ZERO reported product failures.
Features & Benefits

Stackable
QuadBox® JMF ring sections simply stack on top of each other to achieve the required depth. Sections feature a generous overlap and interlock for maximum integrity.

Lightweight
QuadBox® JMF is manufactured from HDPE, a material with excellent strength-to-weight properties. The structural foam twin-wall design reduces weight whilst yielding excellent vertical and sidewall strength.
QuadBox® panels are safe for manual handling with no need for specialist equipment.

Fast Install
QuadBox® JMF has immediate load-bearing strength and offers single step installation, with no need for concrete backfill or raising frame. Installation can typically be completed in less than 1 hour.

Loading
The QuadBox® JMF range offers a maximum top load of 40t on the larger sizes. All sizes are suitable for installations in areas rated B125 under BS: EN 124: 1994. QuadBox® is approved for Openreach installations in pedestrian areas that are rated B125.

Drop-in furniture
Specially designed furniture simply drops into the unique pocket designs in the chamber walls for a secure fit. No drilling, no fixings and no bolting required. Easy to install and to reconfigure. Range includes drop-in steps, wall brackets and Mobra.

Easy Overbuild
Quadbox® JMF lightweight stacking system is ideal for building over installed duct and reduces risk and disruption to the live network. Duct entries or arches are easily cut with a standard holesaw and the chamber HDPE material, being inert, does not produce any toxic dust.

Proven & Trusted
QuadBox® JMF was originally designed for Telecom applications and was the original pre-formed chamber to be approved for use in the Openreach network. QuadBox® JMF meets all Openreach quality requirements and reduces the number of checks to 8 versus 13 for brick and concrete, saving installation time..

Weather Resistant
QuadBox® JMF HDPE material offers excellent weather and chemical resistance. QuadBox® can be installed in all types of weather, unlike with concrete or brick-built chambers where conditions can stop work.

Sustainable & Safe
QuadBox® JMF is manufactured from High Density Polyethylene (HDPE), up to 70% recycled. HDPE is non-polluting and fully recyclable. It is an inert material which does not produce any toxic dust and presents no health risk to operatives or members of the public.
Sizes
Type | Openreach Ref. | Length (mm)* | Width (mm)* | Height (mm) | Max. Load Rating | Product Code |
FW1 | N/A | 300 | 300 | 150 | B125 | UY0000 |
FW1/EN1 | N/A | 600 | 450 | 150 | B125 | UY0001 |
FW2/EN2 | JMF102 | 725 | 255 | 150 | C250 | UY0002 |
FW4/EN4 | JMF104 | 915 | 445 | 150 | D400 | UY0003 |
FW6/EN6 | JMF106 | 1310 | 610 | 150 | D400 | UY0004 |
*Clear openings
Related Products

Furniture & Accessories
Drop-in Steps and Cable Management, Mobra, Floors etc.

Frames & Covers
The comprehensive range includes concrete infill, composite, ductile and recessed and steel covers.
Options
Furniture and accessories can be pre-fitted by Radius as required. We can also pre-drill duct entries to suit.
- Duct Entries
- Furniture
- Floor
Certification
QuadBox® JMF has been approved by Openreach since 2004
Resources
Datasheet