Duct and a method of manufacturing a duct

A duct capable of engaging at least part of a surface area of a heat source, the duct extendable along and engageable with at least part of the surface area of the heat source along all or part of the length of the heat source from a first engagement position to a final engagement position between the duct and heat source, wherein the duct does not come into contact with itself along the length of the duct during normal operating conditions, a heat transfer fluid flowable along an internal conduit of the duct such that heat can be transferred between the duct and the heat source via the heat transfer fluid about the engageable surface areas of the duct and the heat source, the duct being a flexible duct adapted to allow variable thermal transfer via the heat transfer fluid between the engageable surface areas of the duct and the heat source, wherein the heat source comprises a battery pack comprising:

• one or more cells, the battery pack comprises at least one support means configured to provide support to at least one duct, the or each support means is configured to provide support to a duct at a point where the duct changes and/or reverses direction.