100mm SonoFlex Insulated Flexible Duct – Superior Thermal & Acoustic Insulation - 5m
User Guides & Data Sheets
SonoFlex-100-5 - Performance Insulated Flexible Ducting
Condensation | Heat | Noise | Protection
- ✓ 100mm insulated flexible ducting.
- ✓ 5 metre length for practical installation.
- ✓ 25mm Rockwool insulation helps reduce heat loss and condensation risk.
- ✓ Helps soften duct-borne noise in ventilation systems.
- ✓ Robust, flexible and hard wearing for lofts, roof voids and ceiling spaces.
Better Insulation | Better Ventilation Protection
Blauberg SonoFlex™ - 100-5 - 100mm Insulated Flexible Ducting
Blauberg SonoFlex-100-5 is a 100mm insulated flexible ducting solution for extractor fans, MVHR, MEV, dMEV and residential HVAC systems.
It is designed for duct routes that pass through colder areas such as loft spaces, roof voids, ceiling voids, garages and other unheated parts of a building.
The 25mm Rockwool insulation helps limit heat loss, reduce condensation risk and soften duct-borne noise, making it a practical upgrade from standard flexible ducting.
A better-insulated duct route helps the whole ventilation system perform more consistently.
Many ventilation problems begin away from the fan itself.
When flexible ductwork runs through a cold loft or roof space, warm humid extract air can cool quickly. This can increase condensation risk, reduce system efficiency and allow more sound to travel through the duct route.
SonoFlex-100-5 gives those hidden duct runs a protective insulation layer. It combines a flexible aluminium duct with 25mm Rockwool insulation and an aluminium laminate outer jacket.
Use it where ordinary ducting needs thermal, acoustic and moisture protection.
100mm Ducting | Flexible Ductwork | Insulated Extractor Fan Ducting
Why Choose Insulated Flexible Ducting?
Bathroom fans, inline extract fans and continuous ventilation systems often move warm, moisture-laden air through cooler building spaces.
That is where insulated ducting can make a visible difference to a hidden part of the installation.
✓Condensation Control — helps keep extracted air warmer as it travels through cold or unheated spaces.
✓Thermal Insulation — reduces heat transfer compared with non-insulated flexible ducting.
✓Acoustic Support — Rockwool insulation helps absorb vibration and duct-borne sound.
✓Flexible Installation — suitable for short duct connections, final runs and awkward routes where rigid ducting is difficult.
SonoFlex-100-5 is a 4 inch flexible duct option for ventilation installations where airflow, insulation and noise control all need to be considered.
It is especially useful when ducting travels through colder surroundings before reaching an outside grille, roof terminal or wall outlet.
Bathroom extractor fans — for humid extract routes from bathrooms, shower rooms, en-suites and wet rooms.
Inline fan ducting — for insulated connections where the fan is mounted in a loft or ceiling void.
MEV and dMEV ventilation — for continuous extract systems where ducting passes through colder spaces.
MVHR ductwork — for final connections and external air routes where thermal protection is needed.
Air conditioning and HVAC systems — for flexible air duct sections where temperature stability and noise control matter.
Domestic and light commercial projects — suitable for homes, flats, apartments, student accommodation, offices and retrofit upgrades.
1. CONDENSATION: PROTECT COLD DUCT ROUTES
Warm humid air from bathrooms and wet rooms can cool rapidly when it enters ductwork running through a cold loft or roof void.
SonoFlex-100-5 helps slow that temperature drop by wrapping the 100mm air duct in 25mm insulation. This helps reduce the conditions that lead to condensation inside or around the duct route.
✓Bathroom Fan Ducting - suited to moisture-heavy extract applications.
✓Loft and Roof Spaces - helps protect ductwork exposed to cooler surrounding air.
✓Damp and Mould Support - helps reduce excess moisture conditions linked with mould risk.
Insulate the duct route before condensation becomes the callback.
2. HEAT: 25MM ROCKWOOL INSULATION
Ventilation ducting that runs through unheated spaces can lose heat to the surrounding air. This can affect comfort, energy performance and the temperature of extracted or supplied air.
SonoFlex-100-5 uses Rockwool insulation with thermal conductivity of ≤0.04 W/mK to reduce unwanted heat transfer through the duct wall.
✓Insulation Depth - 25mm Rockwool around the flexible duct.
✓Thermal Conductivity - ≤0.04 W/mK.
✓Temperature Range - from -30°C to +140°C.
A simple way to improve thermal protection on exposed flexible duct runs.
3. NOISE: SOFTEN DUCT-BORNE SOUND
Fans, airflow and grilles can all create noise. Rigid or uninsulated duct routes can then carry that sound through the building.
The insulated construction of SonoFlex-100-5 helps absorb vibration and reduce noise transfer along the ducting route.
✓Acoustic Ductwork Support - useful where sound transfer needs reducing.
✓Residential Comfort - suitable for homes, flats, bedrooms and living areas near duct runs.
✓HVAC Noise Control - helps reduce fan and airflow noise travelling through flexible ductwork.
Quieter ducting helps the ventilation system feel better in everyday use.
4. SPECIFICATION: KEY PRODUCT DATA
SonoFlex-100-5 provides a clear specification for installers, consultants, resellers and project teams selecting 100mm insulated ducting.
✓Nominal Diameter - 100mm / 4 inch ducting.
✓Supplied Length - 5 metres.
✓Maximum Air Velocity - up to 25 m/s.
✓Working Pressure - maximum 2500 Pa positive.
✓Outer Jacket - metallic silver aluminium laminate.
For Installers: Make the Duct Route More Reliable
Callbacks often come from the parts of the installation that customers cannot see: dripping ducting, noisy runs, crushed flexible duct or poor airflow from an awkward route.
SonoFlex-100-5 gives installers a more robust option for 100mm flexible ductwork in lofts, ceiling voids and humid extract applications.
It is flexible enough for practical installation while still adding insulation for condensation control, heat retention and acoustic comfort.
Install the ducting detail that supports the fan, not the detail that undermines it.
For Specifiers: A Practical Insulated Ducting Detail
SonoFlex-100-5 supports projects where duct insulation needs to be considered alongside airflow, fire strategy, acoustic comfort and condensation control.
It can be used as part of a ventilation design for MVHR, MEV, dMEV, air conditioning and general HVAC ducting routes, especially where flexible connections pass through unheated or noise-sensitive spaces.
For UK projects, installation should follow Building Regulations, Approved Document F, relevant fire guidance, manufacturer instructions and the project specification.
A clearer duct specification helps reduce uncertainty on site.
For Homes and Landlords: Improve the Hidden Ventilation Route
Good ventilation is not only about choosing the fan. The duct route also affects how the system sounds, how efficiently it moves air and how well it manages humid extract air.
In homes, flats and rental properties, insulated extractor fan ducting can help reduce problems linked to cold roof spaces and long hidden runs.
SonoFlex-100-5 supports a cleaner installation by helping reduce condensation risk, duct-borne noise and unnecessary heat loss.
Better air movement starts with a better protected duct route.
For Resellers: A Clear Upgrade from Standard Flexi Duct
SonoFlex-100-5 gives trade customers an easy-to-understand step up from basic flexible ducting.
The product message is simple: insulation for condensation control, thermal protection and quieter duct routes.
That makes it suitable for customers buying 100mm ducting, 4 inch ducting, insulated ducting for extractor fans, flexible aluminium ducting or general HVAC ductwork.
It helps resellers offer a better answer for common customer questions around bathroom fan ducting, loft installations and ducting through cold spaces.
A stronger product story. A clearer customer benefit. A more practical stocked upgrade.
Choose the Ducting That Supports the Ventilation System.
SonoFlex-100-5 is built for the hidden duct runs where standard flexible ducting may not provide enough protection.
Its 100mm diameter, 5 metre length, 25mm Rockwool insulation and metallic aluminium laminate jacket make it a practical choice for insulated ductwork in homes, flats, retrofit projects and light commercial ventilation.
Use it to support extractor fan ducting, flexible air duct connections, MVHR ductwork, MEV systems, dMEV products and HVAC installations where condensation, heat loss and noise need to be controlled.
Protect the route. Support the airflow. Improve the installation.
Note: Flexible ducting should be installed in line with Building Regulations, manufacturer guidance and project-specific requirements. Keep flexible duct runs as short and straight as practical to support good airflow performance.
| EAN Number | 5056194051835 |
|---|---|
| Size | 102mm |
| Colour | Silver |
| Length | 5 Metres |
| Duct Connection Size | 100mm Dia |
| Delivery Lead Time | Normal |