A subfloor drainage panel for draining moisture or circulating air to or from a surface, said subfloor drainage panel comprising: an upper member; a lower member attached to said upper member, and an intermediate member located in said lower member, said intermediate member defining a plurality of openings, said lower member having a plurality of first projections extending away from said upper member, a plurality of second projections extending toward said upper member, and at least one drainage hole defined in said first projections, said first projections each having a base configured to support said subfloor drainage panel on the surface and side walls tapering towards said base, said second projections each having a height to contact said upper member and including side walls that taper towards said upper member; each opening of the intermediate member configured to receive therethrough a portion of one of said second projections of said lower member; characterised in that: said lower member further comprising at least one ledge between adjacent first projections, the ledge extending away from the upper member a distance less than the first projections to define a gap between said lower member and the surface, to allow fluid to pass therethrough; the sidewalls of each of the first projections includes a plurality of triangularly shaped planar side walls; with multi-angled side walls adjacent said planar side walls; each multi-angled side wall having a triangular shape inverted to that of said planar side wall, with a triangle base of each of said triangular shaped multi-angled side walls being adjacent a peripheral edge of said base of said first projections; each multi-angled side wall including a first section angularly extending from a second section; and wherein the sidewalls of the second projections is at least one planar sidewall extending from the ledge and said second section of said multi-angled sidewall of said first projections. an upper member; a lower member attached to said upper member, and an intermediate member located in said lower member, said intermediate member defining a plurality of openings, said lower member having a plurality of first projections extending away from said upper member, a plurality of second projections extending toward said upper member, and at least one drainage hole defined in said first projections, said first projections each having a base configured to support said subfloor drainage panel on the surface and side walls tapering towards said base, said second projections each having a height to contact said upper member and including side walls that taper towards said upper member; each opening of the intermediate member configured to receive therethrough a portion of one of said second projections of said lower member; characterised in that: said lower member further comprising at least one ledge between adjacent first projections, the ledge extending away from the upper member a distance less than the first projections to define a gap between said lower member and the surface, to allow fluid to pass therethrough; the sidewalls of each of the first projections includes a plurality of triangularly shaped planar side walls; with multi-angled side walls adjacent said planar side walls; each multi-angled side wall having a triangular shape inverted to that of said planar side wall, with a triangle base of each of said triangular shaped multi-angled side walls being adjacent a peripheral edge of said base of said first projections; each multi-angled side wall including a first section angularly extending from a second section; and wherein the sidewalls of the second projections is at least one planar sidewall extending from the ledge and said second section of said multi-angled sidewall of said first projections. said lower member further comprising at least one ledge between adjacent first projections, the ledge extending away from the upper member a distance less than the first projections to define a gap between said lower member and the surface, to allow fluid to pass therethrough; the sidewalls of each of the first projections includes a plurality of triangularly shaped planar side walls; with multi-angled side walls adjacent said planar side walls; each multi-angled side wall having a triangular shape inverted to that of said planar side wall, with a triangle base of each of said triangular shaped multi-angled side walls being adjacent a peripheral edge of said base of said first projections; each multi-angled side wall including a first section angularly extending from a second section; and wherein the sidewalls of the second projections is at least one planar sidewall extending from the ledge and said second section of said multi-angled sidewall of said first projections.