DuoDuct External DuctSlab
ROCKWOOL® DuoDuct is a non-combustible stone wool slab that provides thermal insulation to external ducts carrying warm air, chilled air, or dual-purpose duct systems.
Application(s)
- HVAC
- Ventilation Ducts
Product description
DuoDuct is a non-combustible, dual-density stone wool slab with an aluminium foil facing bonded to the outer surface.
The product is recommended for ductwork with service temperatures up to 230°C. It can also be used in plant rooms, low-level plant work applications, and areas with an increased risk of impact damage.
- Euroclass A1 in accordance with BS EN 13501-1 Reaction to Fire rating
- CE marked in accordance with EN 14303:2009+A1:2013
Areas of application
DuoDuct is suitable for use on the following construction types:
- Ventilation Ducts
Documentation
Please select and download the documentation pertaining to this product. If you require any certification that is not listed here, please contact us via ukdocumentation@rockwool.com

SUIS ROCKWOOL UK
Safe use instruction sheet ROCKWOOL stone wool insulation products
Product properties
| Name | Value | Unit |
|---|---|---|
| Declared thermal conductivity | 0.036 | W/mK |
| Reaction to Fire | A1 | Euroclass |
| Short term water absorption | WS1 | kg/m² |
| Product standard | EN 14303:2009+A1:2013 | |
| CE certificate number | 0751-CPR.2-014.0-10 |
Product variants
Minerva Primary School achieves regulation compliance with ROCKWOOL®
Discover how Minerva Primary Academy's £7.5m two-storey extension, led by Elliott and Charleson Building Services, utilised ROCKWOOL's DuoDuct and Ductwrap for thermal, noise reduction, and non-combustible insulation in compliance with BB101 and BB93
Hands-on fire-stopping training
ROCKWOOL’s specially created expert led one-day course in fire stopping theory and practical installation practice for industry professionals.
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