In general, proper hood design is based on the following factors: Hooding as a standalone method is least desirable, but in some cases, it may be the only appropriate method. What is a CloseCaptureHood?Ĭlose capture hooding is a means to collect emissions from a variety of point sources. The three types of capture strategies we will be discussing in this series are:Ĭlose Capture Hooding. The combination of capture and control is commonly referred to as “overall control” or control efficiency. Together, capture and control determine how much VOC is released to the atmosphere. There are two aspects to controlling emissions of Volatile Organic Compounds (VOCs): collection of VOC emissions (commonly called “capture”) and removal of the collected VOC emissions from the airstream using a control device (commonly called “control”). The vapors then become liquid again, reducing the "loss" of gasoline, as well as removing hydrocarbons from the air, which means less air pollution. Some states require the use of "Vapor Recovery" nozzles which capture the vapor emissions, returning them to the underground gasoline tanks. The displacement of air inside the gas tank causes gasoline vapor emissions (hydrocarbons) to exit out the fill spout (un-controlled) to the atmosphere. Each one of us may contribute fugitive emissions when we fill our automobile gas tanks. Fugitive emissions, in their simplest form, are the uncontrolled release of gases to the atmosphere.
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