Kingspan Kooltherm Duct Insulation

Suitable for use on rectangular, circular and flat oval ductwork in HVAC or building services applications.


Energy-efficient rigid insulation for rectangular, circular and flat oval HVAC ductwork suitable for new build and refurbishment projects in the residential, commercial, institutional and industrial sectors. Comprised of a fibre-free rigid phenolic insulation core externally faced with an aluminium vapour barrier foil and internally with a glass tissue based facing.

Insulated duct support inserts:

Load-bearing insulation inserts can be fabricated from standard boards. Flat, rectangular strips are used on support brackets with rectangular and flat oval ductwork. Curved strips (crocodile strips) or strips of Kingspan Kooltherm Pipe insulation are used on support brackets with circular ductwork.

Features and benefits:

  • CFC-free and HCFC-free, with zero ozone depleting potential (zero ODP) and a global warming potential of ≤5.
  • Certified to BES 6001 ‘Excellent’ (Framework Standard for Responsible Sourcing).
  • 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).
  • BS ISO 45001: 2018 (Occupational health and safety management systems) and BS EN ISO 50001: 2018 (Energy Management Systems).

General information


Faced on one side with a low emissivity aluminium vapour barrier foil, and faced on the other side with a glass tissue based facing.

Foil facing

Glass tissue facing




Phenolic foam


1.2 x 0.6 m

Uniclass 2015

Pr_80_77_76_62 Phenolic foam insulationPrimary


U90/425 Rigid ductwork and fittings

U90/46 Rigid ductwork and fittings

Specification data - Phenolic foam insulation Enhanced data


To BS EN 14314:2009+A1:2013.

Thermal conductivity

0.022 W/m·K from 10–19°C.

Reaction to fire classification

To BS EN 13501-1, class B-s2, d0.

Insulation thickness (minimum)

20 mm.

25 mm.

30 mm.

40 mm.

50 mm.

Vapour barrier



Factory-applied aluminium foil (standard for indoor use).


If the ductwork is to the external of the building the insulation must be covered with a waterproof finish.


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 Kooltherm Duct Insulation

FM approved

FM approved to Factory Mutual (FM) Research Standard 4924 when manufactured and installed in accordance with the conditions defined by the approval. It is a low fire hazard product acceptable in itself, without requiring automatic sprinkler protection

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.

Environmental information

Country of product manufacture

United Kingdom

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