Calculating LEV face velocity to hold plate in place.

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LEV, or Local Exhaust Ventilation, requires a face velocity of 1 m/s to effectively hold a plate in place. The discussion centers on determining the appropriate size and weight of a plate, with or without holes, that would fall off when the face velocity drops below this threshold. It is suggested that holes in the plate are necessary to facilitate airflow, preventing suction from solely holding the plate in place. Participants express uncertainty about how to calculate the specific parameters needed for this scenario. Understanding these dynamics is crucial for effective LEV system design.
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LEV needs to be at 1m/s at the face.
Let’s say area of LEV is .1 m2
What size plate (with holes or not in it) and weight is needed for the plate to fall off if the face velocity is less than 1m/s but the velocity is enough to keep the plate on the lev face if the speed is 1m/s or greater. I think the plate needs holes as otherwise it would be just suction rather than velocity keeping the plate in place.

I have no idea where to start.
 
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mink_man said:
LEV needs to be at 1m/s at the face.
Let’s say area of LEV is .1 m2
What size plate (with holes or not in it) and weight is needed for the plate to fall off if the face velocity is less than 1m/s but the velocity is enough to keep the plate on the lev face if the speed is 1m/s or greater. I think the plate needs holes as otherwise it would be just suction rather than velocity keeping the plate in place.

I have no idea where to start.

What's an LEV?
 
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