Pressure differential indicator with fire stop
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United States of America Patent
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Jul 19, 2016
Grant Date -
Sep 24, 2015
app pub date -
Mar 18, 2014
filing date -
Mar 18, 2014
priority date (Note) -
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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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