Dust control dilution ventilation

Venting The term venting is popularly associated with pressure relief systems and devices, which are installed on enclosed conveyors (pneumatic, air gravity, screw etc.) and silos to prevent pressure buildup and potential explosions. However, sometimes dust is directly vented to either the atmosphere or to a ducting system with or without dilution with air. In this case venting may be classified as a method for non-fugitive dust control by ventilation or Di-Pution. 

In industrial air-conditioning systems, harmful environmental gases, vapors, dusts, and fumes are often encountered. These contaminants can be controlled by exhaust systems at the source, by dilution ventilation, or by a combination of the two methods. When exhaust... 

Dilution Ventilation. Dilution ventilation provides a flow of fresh air into and out of the building. This normally results in a reduction of the background concentration of the flammable atmosphere in the working area but there is no control of the flammable atmosphere at the source of release. This method is not practical for controlling the concentration of dust cloud atmospheres but is often used to control vapor concentrations. 

Ventilation can reduce odors in a room and dilute cigarette smoke. Older air quality standards found in building codes have their origin in studies of acceptable levels of body odor and cigarette smoke. Ventilation can control microorganisms, dusts, and other particulates in hospitals and clean rooms. Some clean rooms use laminar flow to prevent the distribution of particulates in the room. 

Do you use general dilution or local exhaust ventilation systems to control dusts, vapors, gases,... 

As in the case of dust emissions (Section 3.4), some localized containment of fume may be effected by exhaust ventilation (LEV), although for vapours the control achieved is by dilution (Section 4). Additionally for vapours there is the problem of knowing where to implement controls when there is no visual evidence of emission. The insight gained by studies of emission processes remains fundamental to the practical and effective control of volatile pollutants by any means. Investigations into the quality and quantity of post-vulcanization vapours occupy one priority area of current research effort. 

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