This does not happen with horizontal air flow, so there is a low risk of the user contaminating the sample. In the vertical configuration, contamination on your gloves could be carried onto the samples underneath. Contaminants introduced by hands or gloves are quickly removed from the workspace.The air flow travels parallel to the workbench and flows around your hands. Placing your hands inside a horizontal LFH will not disrupt the laminar flow.There are several advantages to choosing a horizontal laminar flow hood. When to Choose a Horizontal Laminar Flow Hood In these hoods, the filters are on the top panel of the unit. At the work bench, the air flow is redirected out of the front panel. Whereas, in a vertical laminar flow hood, the filtered air is directed vertically through the workspace. In a horizontal LFH, the filter is positioned on the back wall, moving air horizontally across the workspace. In a vertical LFH, the filter is positioned on the top panel, moving air down towards the work bench. The filtered air travels parallel to the work bench across the length of the hood and exits through the front opening. Air is pulled from the back of the hood through the filter (usually a HEPA filter). In horizontal laminar flow hoods, t he filters are fixed to the back wall of the unit. Difference Between Horizontal and Vertical Laminar Flow Hoods Neither vertical or horizontal laminar flow hoodsare suitable for handling biohazardous or toxic samples.
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