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HEPA FILTER CEILING vs. MEMBRANE DIFFUSER CEILING

HEPA FILTER CEILING

A downflow containment booth constructed with a 100% HEPA filter ceiling is shown on the left.  The HEPA ceiling construction method must have a large frame with gaskets to support the heavy filters.  In addition, the filters have a frame around the media.  The combination results in a wide space where there is no airflow.  In addition, the addition of lights will further create space where there is no airflow.  The result is shown above using a smoke generator.  The OEL in the operator’s breathing zone is typically 100 ug/m3.  An operator standing below the frame junction between two HEPAs will breathe powder that is drawn upwards from dispensing or sampling.

MEMBRANE DIFFUSER CEILING

A downflow containment booth constructed with a membrane diffuser ceiling is shown on the right.  The membrane diffuser ceiling construction ceiling has a narrow light weight frame to support the light weight membranes.  This method  results in a minimal dead air zone.  Lights are located above the membranes, which results in no dead air zone below.  The result is shown above using a smoke generator.  The OEL in the operator’s breathing zone is  <20 ug/m3An operator standing below the narrow frame junction between two membranes will not breathe powder from dispensing or sampling.



Downflow Containment Booth
with HEPA Ceiling

Downflow Containment Booth
with Membrane Ceiling


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