| see Bath Vanity.
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| 1. A material with a high resistance to vapor movement, such as foil, plastic film, or specially coated paper, that is used in combination with insulation to control condensation. 2. Any material that has a water vapor permeance (perm) rating of one or less. 3. A type of plastic sheeting that both eliminates drafts and keeps moisture from damaging a building or structure. 4. A waterproof membrane placed under concrete floor slabs that are on grade. 5. Material used to retard the movement of water vapor into walls, and prevent condensation in them; applied separately over the warm side of exposed walls or as a part of batt or blanket insulation. 6. Thin plastic or metal foil sheet used in air-conditioned structures to prevent water vapor from penetrating insulating material.
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| A cooling process that transforms heat from one location to another; heat is forced to flow from a region of lower temperature to a region of higher temperature; similar to a refrigerator for cooling food.
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| A cleaning process utilizing condensing solvent as the cleaning agent.
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| Condition where liquid is trapped in line because of bend or improper installation; such vapor prevents liquid flow.
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| The movement of water vapor from a region of high vapor pressure to a region of lower vapor pressure.
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| Graphic presentation of various pressures produced by refrigerant under various temperatures.
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| Pressure imposed by either a vapor or gas.
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| sealing material made of asphalt-saturated felt.
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| A layer of material intended to obstruct the passage of water vapor through a building assembly; also called a Vapor Barrier; sealing material placed between building components or materials to arrest movement of moisture within building enclosure assembly.
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| see Saturated Vapor.
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| The gaseous state of any substance.
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| Conversion from liquid or solid to a gaseous state.
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| An air handling system, unlike a single zone, terminal reheat, multi-zone, or dual duct, supplies air at a constant temperature and varies the air quantity supplied to each zone.
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| Pulley which can be adjusted to provide different pulley drive ratios.
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| A mortgage that allows the lender to raise or lower the interest rate from time to time as some specified index rises or falls.
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| Changing; subject to change, not constant; indeterminate.
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| A deviation in a building or zoning ordinance granted by an appeal authority upon relevant grounds being proven.
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| A thickened preparation of drying oil or drying oil and resin; when applied to a surface, it leaves a hard, glossy, transparent coating; may also be mixed with pigments to make enamels; clear varnish is a slightly yellow, semitransparent liquid.
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| Application of varnish to a surface using a brush.
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| Interior varnish tinted with pigments or dyes.
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| Dyes formed in fabrics by oxidation and precipitation of the original dye liquor, for example, indigo; vat dyeing refers to a kind of dye rather than a method of dyeing; raw stock dyeing, skein dyeing, or solution dyeing can be performed with vat dyes.
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| A hinged, pivoted, or sliding member that permits passage to an enclosure built for safety or security.
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| 1. An arched surface. 2. An arch translated along an axis normal to the plane of its centerline curve. 3. A room to store valuable items.
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| Variable Air Volume.
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| Type of belt commonly used in refrigeration work; it has a contact surface with the pulley which is in the shape of the letter V.
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| Vitreous Clay Pipe.
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| Video Display Unit.
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| 1. A quantity having direction as well as magnitude; usually represented by a line in space with an arrowhead indicating direction and the scale of the line representing magnitude. 2. A carrier of disease, such as a roach, rat, or mouse.
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| Oils obtained from the seeds or nuts of vegetable growth, including linseed, soybean, perilla, tung, or castor.
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