Respuesta :

According to the table on bsl’s, hepa filters for exhaust air are absolutely required at BSL4.

What is biosafety level?

A biosafety level (BSL), can be regarded as the  pathogen/protection level, and these are the biocontainment precautions that is needed to be kept so that harmful agent can be get rid of.

Therefore at ,  exhaust air are absolutely required at BSL4 because it is needed to  isolate dangerous biological agents.

Learn more about biosafety level at: https://brainly.com/question/8430576

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