HDR Architectural Abbreviation

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Length of pipe or vessel to which two or more pipe lines are joined carries fluid from a common source to various points of use. The fireproof area directly in front of a fireplace. The inner or outer floor of a fireplace, usually made of brick, tile, or stone. A brick laid with its short end to the face of the wall. A structural member located between two joists or between a joist and a wall which carries another joist or joists.