Flexible glass wool insulation lining for HVAC ducts
Flexible internal lining for HVAC ducts.

Product Description

Sonic Liner is a flexible glass wool insulation blanket faced with an acoustically absorbtive black woven glass cloth on the air stream surface. A 35 mm overlap of the facing material is provided on both sides to enable effective sealing. It provides outstanding acoustical and thermal performance with low air friction.
It is specially designed as an internal acoustical insulation liner for sheet metal ducts in heating, ventilation and air conditioning systems operating at temperatures of up to 120˚C and air velocities up to 20 m/s.
Sonic Liner Product
Sonic Liner Application
Sonic Liner ProductSonic Liner Application

Key benefits

Lifelong energy savings
Excellent thermal and acoustic properties
Maintenance free
Minimal air friction while optimising free duct area
Safe application and use
The air stream will not erode or release fibres into the air stream under normal operating conditions


  • Significanty reduces heat gain and loss
  • Exceptional acoustic insulation properties
  • Zero ozone depleting potetntial
  • Zero global warming potential
  • Non-combustible
  • Prevents condensation on cold metal duct surfaces extending the life of the system

Technical Properties

ConductivityK0,036W/m.K24 kg/m³
ConductivityK0,038W/m.K18 kg/m³

Variants Details


SKU Thickness Width Length Thermal resistance NRC Value
10030 (24D) 25 1200 10000 0,69 0,85
10683 (18D) 50 1200 10000 1,32


Stock items (1 - 3 working days)
Standard items (3 - 7 working days)
Made to order items (7 - 15 working days)
  • Non-combustible - tested to SANS 10177 Part 5
  • Class 1 fire index rating - tested to SANS 10177 Part 3
  • Tested to ASTM E-84
    • Flame Spread Index: 20
    • Smoke Development Index: 10


Specially designed as an internal acoustic insulation liner for sheet metal ducts in heating, ventilation and air conditioning systems operating at temperatures of up to 120℃ and air velocities up to 20 m/s.