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| Zip strip
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T-shaped vinyl strips used to form expansion joints in concrete slabs are inserted into the concrete immediately after finishing. Once the concrete is set, the top strip is peeled away to expose the concealed joint. |
| Zirconia alumina abrasive
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Zirconia alumina is the toughest man-made abrasive. It outperforms all other abrasives for stock removal on all types of materials, including wood, metal and fiberglass. It resists wear and features the ability to re-sharpen itself under heavy grinding pressures. These characteristics make it the best choice for belt sanding. |
| Zonal cavity lighting
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The calculation of the amount of light needed in a room done by dividing the room into zones and determining the needs of each particular area. The Illumination Engineering Society has advised the lighting requirements of each zone: the ceiling cavity, the room cavity and the floor cavity. |
| Zonal control
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A method of designing and controlling the HVAC system of a residence so that living areas can be maintained at a different temperature than sleeping areas using independent setback thermostats. If specific requirements are met, zonal control may earn a credit towards compliance with whatever building energy efficiency standards are applicable. |
| Zone
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An area within the interior space of a building, such as an individual room(s), to be cooled, heated, or ventilated. A zone has its own thermostat to control the flow of conditioned air into the space. |
| Zone heat
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A central heating system in a building, designed to allow different temperatures to be maintained in two or more parts of the building. |
| Zone of aeration
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The layer in the ground above the water table where the available voids are filled with air. Water falling on the ground percolates through this zone on its way to the aquifer. |
| Zone of saturation
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The layer in the ground in which all of the available voids are filled with water. |
| Zone representative
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Person, such as an elected official, who represents a zone. |
| Zone switching
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Lights operated by electrical switches in a section (zone) of a room. |
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