PRESSURE DIFFERENTIAL INDICATOR WITH FIRE STOP
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Jul 18, 2016
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Mar 18, 2014
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Abstract
An across the wall pressure differential indicating apparatus comprising a wall duct having first and second open ends, first and second mounting plates respectively attached to the wall duct at the first and second open ends respectively, a low speed airflow indicator adapted to indicate a pressure differential and mounted in fluid communication with the wall duct such that substantially, all airflow passing through the wall duct also passes through the indicator, and an intumescent material disposed in the wall duct between the first and second ends.
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