Kingspan Therma Duct Insulation

Suitable for use on rectangular, circular and flat oval ductwork in HVAC/ building services applications for both new build and refurbishment projects in the residential, commercial, institutional and industrial sectors.


An energy efficient rigid insulation for rectangular, circular and flat oval HVAC ductwork installed outdoors that is suitable for new build and refurbishment projects in the residential, commercial, institutional and industrial sectors. The insulation has a fibre-free rigid polyisocyanurate (PIR) insulation core, faced on both sides with a protective low vapour-permeability trilaminate foil.

Insulation located outdoors must be protected with a compatible weatherproof material.

Insulated duct support inserts:

Load-bearing insulation inserts can be fabricated from standard insulation boards for ductwork installed outdoors.

Flat rectangular insulation strips are used on support brackets with rectangular and flat oval ductwork. Curved strips (crocodile strips) or strips of Tarec™pir pipe insulation are used on support brackets with circular ductwork.


Kingspan Therma™ Duct insulation boards are manufactured to the highest standards under a quality control system certified to:

  • BS EN ISO 9001: 2015 (Quality Management Systems. Requirements).
  • BS EN ISO 14001: 2015 (Environmental Management Systems. Requirements).
  • BS OHSAS 18001: 2007 (Health and Safety Management Systems. Requirements).


CFC-free and HCFC-free, with zero ozone depleting potential (ODP) with a global warming potential (GWP) of ≤5.

BES 6001:

Certified to BES 6001 ‘Excellent’ (Framework Standard for Responsible Sourcing).

General information




Low emissivity composite foil


Polyisocyanurate (PIR) foam


1200 x 600 mm

1200 x 2400 mm

Uniclass 2015

Pr_65_65_25_64 Pre-insulated ductwork and fittingsPrimary
Pr_80_77_76_65 Polyisocyanurate (PIR) insulation


U90/46 Rigid ductwork and fittings

U90/425 Rigid ductwork and fittings

Specification data - Pre-insulated ductwork and fittings Enhanced data

Insulation material

Factory-applied aluminium foil. Rigid slabs.

Standard for indoor use.


Aluminium foil faced.




Banding (preferably aluminium) and matching seals for circular ductwork, mechanical fixings on rectangular ductwork and a high strength self-adhesive aluminium foil vapour barrier tape.

Product Reference

Kingspan Therma Duct Insulation

Insulation material

Polyisocyanurate (PIR) foam.

FM approved


Global warming potential


Ozone depletion potential


Compressive strength (minimum)

100 kPa at 10% compression.

Closed cell content


Nominal density range

30–35 kg/m³.

Face Size (length x width)

600 x 1200 mm.

1200 x 2400 mm.


0.023 W/m·K from 10–19°C.

Reaction to fire classification:

BS EN 13501-1, class E.


20 mm.

25 mm.

30 mm.

40 mm.

50 mm.


The insulation must be covered with a waterproof finish.

Environmental information

Country of product manufacture

United Kingdom

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