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Question:
How often does a HEPA filter need to be certified?
A
Every 6 months
explanation
USP ,797. requires that a laminar airflow workbench must be certified every 6 months un- less the HEPA filter becomes wet.
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Shaniac20
5 years ago
I recommend!
Mingy6
5 years ago
I like this App a lot. I got a few apps to prepare for PTCE but this is the best one so far! It has tests and practice questions with explanations.
Bfarley14
4 years ago
Awesome app