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| Dual contract
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Illegal practice of having two contracts for the same transaction. For example, having one contract for a higher amount so that more money can be borrowed. |
| Dual divided agency
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Representation of two or more parties in a transaction by the same real estate broker. |
| Dual duct system
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An air conditioning system that has two ducts, one is heated and the other is cooled, so that air of the correct temperature is provided by mixing varying amounts of air from each duct. |
| Dual element heater
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An electric water heater with an upper and lower element for heating water. |
| Dual fuel system
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A dual heating system, for example a heat pump and a fossil fuel furnace. |
| Dual level drain
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An item that will permit drainage at two different levels. |
| Dual listing
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Listing where a real estate broker represents both the buyer and seller, creating two principals. |
| Dual motion sander
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Dual motion sanders give users the ability to choose between straight-line strokes and orbital motion for finish sanding or stock removal. |
| Dual voltage
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Dual voltage allows a power tool to convert from standard 120 volts to 240 volts for cooler motor operation under heavier loads. |
| Dual-duct system
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A central plant heating , ventilation and air conditioning (HVAC ) system that produces conditioned air at two temperatures and humidity levels. The air is then supplied through two independent duct systems to the points of usage where mixing occurs. |
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