dernier étage de filtration

Dynamo L

Senior Member
English - United Kingdom
I'm a bit unsure of the word 'étage' here. Is the 'efficacité du dernier étage de filtration' the 'last stage filter efficiency', or the 'last level filter efficiency', speaking in terms of the height of the building?

Many thanks in advance!
 
  • Dynamo L

    Senior Member
    English - United Kingdom
    Apologies - it's true that I ought to have provided more context! It's speaking about air filtration in a factory where dust particles have to be kept to a minimum. Would that make 'level' more likely, given what has already been said above?
     
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