![](http://www.alamy.com/thumbs/6/BFD591BC-F700-4F0C-8BEF-BEE1B08261D9/2C98WYP.jpg)
PAO or DOP - HEPA Filter Integrity Test and Airflow Visualization Test.
Size: 3968px × 2976px
Photo credit: © Sucharas Wongpeth / Alamy / Afripics
License: Royalty Free
Model Released: No
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