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Term Definition
Reflective Coated Glass. Glass onto which a thin layer of metal or metal oxide has been deposited to reflect light and/or heat.  
Reflective Paint. Paint that has been formulated to reflect light away.  
Reflector Lamp. Flood lamp or spot with bulb coated with a reflecting surface.  
Reflector Lighting. A lighting fixture with a polished surface to redirect its light.  
Reflectorized Sign. A sign made with highly reflective material.  
Refraction. The bending of a light ray as it passes obliquely through a material.  
Refractive Index. Ratio of velocity of light in a certain medium compared with its velocity in air under same conditions.  
Refractories. Heat-resistant non-metallic ceramic materials.  
Refractory Concrete. Concrete having refractory properties, and suitable for use at high temperatures (generally about 315 to 1315° C), in which the binding agent is a hydraulic cement.  
Refractory. Capable of enduring high temperature.  
Refrigerant Charge. Quantity of refrigerant in a system.  
Refrigerant Control. Device which meters flow of refrigerant between two areas of a refrigerating system; can be a capillary tube, expansion valves, or high and low-side valves; maintains pressure difference between high-pressure and low-pressure side of the mechanical refrigerating system while unit is running.  
Refrigerant Cylinder. Cylinder in which refrigerant is stored and dispensed; color code painted on cylinder indicates kind of refrigerant.  
Refrigerant. substance used in refrigerating mechanism; it absorbs heat in evaporator by change of state from a liquid to a gas, and releases its heat in a condenser as the substance returns from gaseous state back to a liquid state.  
Refrigerated Case. A storage unit using refrigeration to keep food or materials cool.  
Refrigerated Truck. Commercial vehicle equipped to maintain below-ambient temperatures in its storage compartment.Refrigeration Oil.Specially prepared oil used in refrigerator mechanism which circulates, to some extent, with refrigerant.  
Refrigeration Tubing. The hollow, cylindrical piping which holds the refrigerant fluid in a refrigeration system.  
Refrigeration. The cooling of a material or space.  
Refrigerator, Blood. see Blood Refrigerator.  
Refuse Driven Fuel (RDF). A method of recovering heat, in an incinerator, from solid waste.  
Refuse Hopper. A funnel-shaped receptacle having a device for releasing waste materials through a pipe.  
Regional Shopping Center. A large shopping center serving a region.  
Register, Wall. Awall mounted grille or damper for the passage of conditioned air.  
Register. Combination grille and damper assembly covering an air opening or the end of an air duct.  
Registered Architect. An architect who is registered with the state board of architectural examiners of one of the states; a licensed architect.  
Reglet. A horizontal or sloping slot in masonry construction, or a sheetmetal slot in plastered wood construction, to accept the upper edge of counterflashing.  
Regular Core Gypsumboard. Gypsumboard for general construction purposes without special core additives.  
Regulations. Laws that are enacted by a public administrative agency, rather than by an elected legislative body.  
Regulator. A device for controlling the delivery of gas at some substantially constant pressure regardless of variation in the higher pressure at the source.  
Rehabilitation. The remodeling of a building to render it suitable for modern uses.  

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