A furring channel that is also known as hat channel or top hat, is a metal framing element that is used to level surface for the attachment of insulation and wall finish. They also create an air gap that reduces thermal bridging and allow for a reflective insulation to work properly. Furring channels also provide resistance to condensation. These elements improve the energy efficiency performance of walls and ceilings and are proposed as solutions in ESD or JV3 performance solution reports. The most commonly used furring channel size in Australia is 28mm x 38mm (depth x width).