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Term Definition
Combination Receptacle. An electrical fixture with an outlet for plugging in an electrical appliance, along with an electric switch for operating another circuit.  
Combination Switch. A switch that includes a switch and a receptacle.  
Combined Chlorine. Chlorine combined with other substances; though available to disinfect pool water; chlorine in this form is less effective than free chlorine.  
Combined Footing. A concrete footing which supports two or more columns.  
Combined Stress. The combination of axial and bending stresses in a structural member.  
Combined Water. The water, chemically held as water of crystallization, by the calcium sulphate dihydrate, or hemihydrate crystal.  
Combustible. Capable of being burned.  
Combustion. Burning; consumption by fire; the development of light and heat from the chemical combination of a substance with oxygen.  
Comfort Chart. Chart used in air conditioning to show the dry bulb temperature, humidity and air movement for human comfort conditions.  
Comfort Cooler. System used to rce the temperature in the living space in homes; these systems are not complete air conditioners as they do not provide complete control of heating, humidifying, dehumidification, and air circulation.  
Comfort Zone. Area on psychrometric chart which shows conditions of temperature, humidity, and sometimes air movement in which most people are comfortable.  
Commerce. 1. The exchange or buying and selling of commodities, especially on a large scale involving transport within a country or between countries. 2. The principles and techniques of business and office systems.  
Commercial Carpet. Carpet that is highly resistant to heavy traffic.  
Commercial Door. A type of door used for strength and durability in commercial building applications.  
Commercial Facilities. Facilities that are intended for nonresidential use and whose operations will affect commerce, including factories, warehouses, office buildings, and other buildings in which employment may occur.  
Commercial Matching. Matching of colors within acceptable tolerances, or with a color variation that is barely detectable to the naked eye.  
Commercial Standard (CS). U.S. Dept. of Commerce, Govt. Printing Office, Washington, DC 20402.  
Commercially Acceptable Standards. Of workmanship, the standard of work produced by the average competent craftworker, allowing a reasonable amount of imperfections; not perfect.  
Commingling of Funds. To combine funds belonging to different accounts into a single account  
Commission. 1. The professional fee paid to a broker or agent for services, usually calculated as an agreed percentage of the sales or lease consideration. 2. A fee paid to an agent or employee for transacting a piece of business or performing a service.  
Commissioning. Start-up of a building that includes testing and adjusting HVAC, electrical, plumbing, and other systems to assure proper functioning and adherence to design criteria; also includes the instruction of building representatives in the use of the building systems.  
Commitment. 1. A legally enforceable agreement to do something in the future. 2. A pledge by a lending institution to make a real estate loan under certain stated conditions.  
Commode. 1. A chest of drawers. 2. A chamber pot concealed in a chair with a hinged cover.  
Common Bolt. An ordinary carbon steel bolt.  
Common Bond. Brickwork laid with each five courses of alternating stretchers followed by one course of headers.  
Common Brick. Inexpensive brick, not selected for appearance, that is used as filler or backing. See Building Brick.  
Common Enemy Doctrine. The legal doctrine that flood waters are a common enemy and that property owners may fight to protect their property regardless of the damage to neighboring property.  
Common Rafter. A rafter that is square with the plate and extends to the ridge.  
Common Seal-P Trap. A P-trap with a water seal depth of 2 to 4 inches.  
Common Vent. A vent that connects at the junction of two fixtures, acting as a vent for both fixtures.  

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