The VFD160/10INS is a 160mm diameter insulated flexible ducting hose, supplied in a 10-metre roll, designed for connections within 160mm ventilation systems where thermal insulation is required alongside flexibility — typically loft-run connections to MVHR units, or any section of ductwork passing through cold, unheated spaces. The construction combines a flexible inner duct core with an insulating outer jacket, helping to prevent condensation and reduce heat loss along the run while allowing the hose to be routed around obstacles that rigid spiral duct cannot easily pass.
Flexible
Routes Around Obstacles
Where to Use Insulated Flex: Use the VFD160/10INS where the 160mm duct run passes through a cold, unheated space (loft void, cold roof space) — the insulation jacket helps keep the internal duct surface above the dew point of the airstream, reducing condensation risk on the duct.
Avoid Compression: Like all flexible ducting, the VFD160/10INS should be installed fully extended and routed with the fewest, gentlest bends possible. Compressed or kinked flexible duct significantly increases airflow resistance and reduces both airflow and the effectiveness of the insulation.
Key Features
Insulated Outer Jacket
The outer insulation layer helps reduce heat loss and condensation risk on duct sections that run through cold spaces such as loft voids, where bare metal duct would otherwise reach dew point.
10-Metre Roll
Supplied as a 10m roll, giving enough length for full flexible loft runs or several shorter connections from one roll, reducing the number of joints in the system.
Flexible Routing
The flexible core allows the duct to be routed around joists, purlins, and other loft obstacles that rigid 160mm spiral duct cannot navigate without additional bends.
MVHR Loft Connections
A common application is connecting an MVHR or MEV unit to the rigid 160mm spiral distribution network via a short insulated flexible run in the loft.
Worm Clip Connection
The hose ends are secured over the male spigots of 160mm fittings or connectors using worm-drive hose clips (WDC160), sold separately.
Cuttable to Length
The 10m roll can be cut to the required length on site using strong scissors or a utility knife — keep cut ends clean and re-secure the insulation jacket if it becomes loose at the cut.
Specifications
| Reference |
VFD160/10INS |
| Diameter |
160 mm |
| Length |
10,000 mm (10 m roll) |
| Construction |
Flexible inner duct core with insulated outer jacket |
| Typical Use |
MVHR/MEV loft connections, cold-space duct runs |
| Connection Method |
Slide over male spigot, secure with worm-drive clip (WDC160) |
| Installation Note |
Install fully extended — avoid compression and sharp bends |
Frequently Asked Questions
Why does this duct need insulation if the rest of the system is bare metal?
Insulation is most important where ductwork passes through cold, unheated spaces such as loft voids. The jacket helps keep the inner duct surface above the dew point of the air inside, reducing the risk of condensation forming on or inside the duct in these areas.
Can I cut the 10m roll into shorter sections?
Yes — cut the hose to the length required for each connection using sharp scissors or a utility knife. Make sure the insulation jacket at the cut end is neat and, if necessary, taped to prevent it slipping back during installation.
How do I connect this flexible duct to the rigid 160mm spiral system?
Slide the flexible duct end over the male spigot of a 160mm fitting or connector, then secure with a WDC160 worm-drive clip to hold it firmly and improve the seal at the joint.
Is this duct suitable for a tumble dryer exhaust?
No — tumble dryer exhaust carries hot, moist, lint-laden air that is not suitable for standard insulated ventilation flex. Use only ducting specifically rated and approved for tumble dryer exhaust applications.
How much can the hose be compressed during installation?
It shouldn't be compressed at all where avoidable — install the hose at, or close to, its fully extended length. Compression significantly increases airflow resistance and reduces the effective thermal performance of the insulation jacket.
