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The time, in minutes or hours, that materials and assemblies have withstood a fire exposure as established in accordance with the test procedures of NFPA 251, ASTM E 119, or UL 723, Standard Methods of Tests of Fire Endurance of Building Construction and Materials.

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Secondary members: Members which carry loads to the primary members. In metal building systems, this term includes purlins, girts, struts, diagonal bracing, knee braces, and other miscellaneous framing. 

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Secondary members: Members which carry loads to the primary members. In metal building systems, this term includes purlins, girts, struts, diagonal bracing, knee braces, and other miscellaneous framing. 

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Refers to the taking up and holding of water by various processes such as absorption and adsorption.

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Web: That portion of a structural member between the flanges. 

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Web: That portion of a structural member between the flanges. 

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 Equipment, materials, or services included in a list published by an organization acceptable
to the authority having jurisdiction and concerned with evaluation of products or services and whose
listing states either that the equipment, material, or service meets identified standards or has been
tested and found suitable for a specified purpose. 

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A thermometric scale in which 32°F denotes freezing and 212°F the boiling point of water under normal sea level atmospheric pressure of 14.7 psi.

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Attenuation- The Sound reduction process in which sound energy is absorbed or diminished in intensity as the result of energy conversion from sound to motion or heat.
Fire Resistance Rating- This is measured in time, minutes, hours, which is the materials and assemblies have withstood fire exposure.
Acoustical material- Having acoustical properties, a material that absorbs sound.

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Homogenous material: A material in which relevant properties are not a function of the position within the material

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Homogenous material: A material in which relevant properties are not a function of the position within the material

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Absorption: The taking up of water in bulk by matter (such as insulation); penetration of water into the insulation
Density: The mass per unit volume of in place thermal insulation.
Conduction, thermal (C): The time rate of steady state heat flow through a unit area of homogeneous material induced by a unit temperature gradient perpendicular to that unit area.
Humidity: The mass of water vapor per unit volume.

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sound isolation: Lack of acoustical connection. There are basically two ways to achieve a degree of sound isolation: (1)By insulation, preventing the sound from reaching a receiving location; (2) By attenuation, reducing sound intensity as it travels toward a receiving location.

Reverberation: The persistence of sound in an enclosed or partially enclosed space after the source of the sound has stopped.

Relative humidity: The ratio of the mole fraction of water vapor present in the air to the mole fraction of water vapor present in saturated air at the same temperature and barometric pressure.

Direct sound field: The sound that arrives directly from a source without reflection.

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Heat flow -  The rate at which heat moves from an area of higher temperature to an area of lower temperatures. Btu/hr (W/hr) Heat flow is generally used to quantify the rate of total heat gain or heat loss of a system.
Noise -  Unwanted sound.
Beam -  A primary member, usually horizontal, that is subjected to bending loads. There are three types: simple, continuous, and cantilever.
Water vapor diffusion -  The process by which water vapor spreads or moves through permeable materials caused by a difference in water vapor pressure.

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