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Duct (industrial exhaust)
Industrial exhaust ducts are pipe systems that connect hoods to industrial chimneys through other components of exhaust systems like fans, collectors, etc. Ducts are low-pressure pneumatic conveyors to convey dust, particles, shavings, fumes, or chemical hazardous components from air in the vicinity to a shop floor or any other specific locations like tanks, sanding machines, or laboratory hoods. Ducts can be fabricated from a variety of materials including carbon steel, stainless steel, PVC, and fiberglass. 〔(Duct Work Assembly ) U.S. Bellows, (retrieved May 2012)〕 They can be fabricated through rolling (preferable for ducts of 12" or more in diameter) or extruded (for ducts up to 18").〔(KCH Engineered Systems ) 〕
HVAC systems do not include this category of industrial application, namely exhaust systems. A distinction from HVAC system ducts is that the fluid (air) conveyed through the duct system may not be homogeneous. An industrial exhaust duct system is primarily a pneumatic conveying system and is basically governed by laws of flow of fluids.〔() ASHRAE Technical Committee 5.2 - Duct Design〕
== Fluid flow ==
The conveying fluid that flows through the duct system is air. Air transports materials from the hood to a destination. It is also instrumental in capturing the material into the flow system. Air is a compressible fluid, but for engineering calculations, air is considered as incompressible as a simplification, without any significant errors.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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