Abbreviation Definition
OAHSOxfordshire Architectural and Historical Society
OALOutdoor Area Lighting
OALOutside Air Louver
OAMOpen Architecture Management
OANOpen Architecture Network
OAWOttawa Architecture Week
OBCOntario Building Code
OBLOblique
OCAOpen Control Architecture
OCCSOverall Construction Classification System
OCFAOpen Computer Forensics Architecture
ODOuter Diameter
ODOutside Dimension
ODATOhio Design Assistance Team
OEOBOld Executive Office Building
OESCOntario Electrical Safety Code
OFCOntario Fire Code
OFCHOil-Fired Central Heating
OFCIOwner Furnished, Contractor Installed
OFLOver-FLow alarm

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