Patent ID: 8382004

Claim:
A method of heating a space of a building comprising: (a) providing a planar boundary structure defining an interior surface of said space, said structure including a structure substrate, (b) providing a heating element in heat transfer relationship with said structure substrate, and (c) providing a heat spreader in roll form, wherein the heat spreader comprises a layer of compressed particles of exfoliated graphite having an in-plane thermal conductivity of at least 450 W/m° C., wherein said heat spreader has a thermal anisotropy ratio of at least 225, said ratio being defined as a ratio of a thermal conductivity parallel to said interior surface to a thermal conductivity normal to said interior surface; (d) unrolling the heat spreader and positioning it in heat transfer relationship with said heating element and said structure substrate; (e) providing heat energy to heat spreader and said structure substrate from said heating element.