SpiroFlex double-wall duct 80/125 mm white, 1 m (model SX-TD80/125RB)

SpiroFlex double-wall duct 80/125 mm in white, length 1 m (model SX-TD80/125RB) is a concentric duct section designed for ventilation and flue systems where an inner and outer conduit are required within a single compact profile. The 80/125 mm concentric arrangement provides a separate internal channel for exhaust or supply air and an external annular space that can be used for fresh air, insulation or clearance to combustible structures. The white finish makes this 1 m section suitable for visible installations in residential and light commercial interiors.

Advantages

This double-wall duct combines a concentric profile with a one-metre length for straightforward integration into stacked or linear duct runs. The concentric geometry simplifies installation where space or clearances are limited by allowing two flows within one assembly. The white surface facilitates visual integration into interiors and can be painted or covered if required. The product is designed to reduce the complexity of separate inner and outer ducts by providing both in a single component, which can cut installation time and minimize joint fittings.

Suitable for

• Residential ventilation and balanced flue systems requiring a concentric 80/125 arrangement
• Light commercial premises with compact duct routing or limited clearance to walls
• Retrofit projects where replacing separate ducts with a concentric section reduces space needs
• Installations that require a visible, finished white duct section of 1 m length

When it may not be suitable

This 1 m concentric section is not intended to replace full custom ductwork where extensive routing, bespoke bends, or multiple diameter transitions are required; complex systems may need additional fittings or sections. It is also not suitable where specific fire-rating, acoustic insulation, or chemical resistance standards beyond standard ventilation practice are mandatory, unless confirmed by project specifications.

Key specifications

• Concentric diameters: inner 80 mm, outer 125 mm
• Length: 1 metre
• Colour/finish: white
• Structure: double-wall/concentric profile providing inner and outer conduits
• Typical applications: ventilation and flue/vent systems for residential and light commercial use

How to use

Position the 1 m concentric section inline with the existing duct run, ensuring correct orientation of inner and outer conduits for the intended airflows. Secure joints using compatible clamps or sealing methods recommended for ventilation and flue installations, and add flexible connectors or gasketed collars where movement or vibration is expected. Confirm clearance and sealing requirements around the outer conduit, and follow local codes for termination, support spacing and any insulation or fire-stopping where the duct passes through walls or floors.

What to consider before purchase

• Confirm that the 80/125 concentric diameters match the rest of your system and any terminal devices
• Check local building and flue-venting regulations for clearance, fire-stopping, and material suitability
• Assess whether additional fittings (bends, reducers, supports, seals) are needed to complete the installation
• Ensure the white finish and 1 m length fit the aesthetic and layout requirements of the project

Usage recommendations

Use this SpiroFlex concentric 80/125 double-wall section as part of a coordinated ventilation or flue installation. Maintain recommended support spacing, seal all joints to prevent air leakage, and verify correct airflow direction through the inner and outer conduits. For installations involving combustion appliance venting, follow appliance manufacturer guidance and local codes for safe clearances and termination.