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Term Definition
Open Compressor. An external drive compressor; not hermetic.  
Open Decking. A deck in which the joists on the underside are exposed.  
Open Display Case. Commercial refrigerator designed to maintain its contents at refrigerating temperatures even though the contents are in an open case.  
Open Front Seat. A toilet seat with an open gap at the front, usually used in public toilet rooms for improved sanitation.  
Open Listing. A listing agreement with one or more real estate brokers to sell or lease ones property on a non-exclusive basis.  
Open Run-Around. A method of heat recovery from exhaust air in which a fluid is inserted alternately in the supply and exhaust air stream; this system transfers both sensible and latent heat.  
Open Time. The period of time during which the bond coat retains its ability to adhere to the tile and bond the tile to the substrate.  
Open Type Compressor. see Compressor, Open Type.  
Open Type Decking. A deck in which the joists on the underside are exposed.  
Open-Graded Aggregate. One containing little or no mineral filler and in which the void spaces in the compacted aggregate are relatively large.  
Open-Graded Asphalt Friction Course. A pavement surface course that consists of a high-void, asphalt plant mix that permits rapid drainage of rainwater through the course and out the shoulder. The mixture is characterized by a large percentage of one-sized coarse aggregate. This course prevents tire hydroplaning and provides a skid-resistant pavement surface.  
Open-Grained Wood. Woods with large pores, such as oak, ash, chestnut, and walnut; also known as Coarse-Grained or Coarse Textured.  
Open-Web Steel Joist. A prefabricated, welded steel truss used at closely spaced intervals to support floor or roof decking.  
Operable Door. A door, of a pair, that is normally operable.  
Operable Part. A part of a piece of equipment or appliance used to insert or withdraw objects, or to activate, deactivate or adjust the equipment or appliance, such as a coin slot, pushbutton, or handle.  
Operating Instructions. The written explanations and descriptions furnished by manufacturers and fabricators of building equipment and components for the proper operation of their products.  
Operating Leverage. The ratio of the percentage change in profit to the percentage change in sales.  
Operating Pressure. Actual pressure at which a refrigerating system works under normal conditions; this pressure may be positive or negative (vacuum).  
Operating Profit. Revenue of the business less the total of all costs of the operation.  
Operating Room. A room in a hospital for surgical operations.  
Operation Expenses. Total of all expenses including cost of sales, general and administrative expenses as well as indirect operating expenses.  
Opposed Blades. Two sets of blades in a damper, linked so that the adjacent blades can open and turn in opposite directions.  
Option. 1.Something that may be chosen. 2. A right given for a consideration to keep an offer to purchase or lease open for a specific time.  
Optionee. 1. One who receives an option. 2. The prospective purchaser or lessee in a real estate option.  
Optionor. 2. One who gives an option. 2. The owner-seller or lessor in a real estate option  
Or Equal. The phrase used in specifications providing that substitutions must be equal in all relevant respects and usually subject to the approval of the architect.  
Oral Agreement. A contract in words that are not rced to writing.  
Orange Mineral. Red lead prepared by roasting basic carbonate white lead; used mainly in printing ink for its characteristic color.  
Orange Peel. 1. A pitted texture of a fired glaze resembling the surface of rough orange peel. 2. Spray painting defect in which the lacquer coat does not level down to a smooth surface but remains rough, like the peeling of an orange.  
Orbital Sander. A hand-held platform sander that moves rapidly in a circulatory movement.  

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