How many clauses in ISO!
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Answer / sowjanya
ISO Class Average number of air changes per hour
ISO 5 240–360 air changes per hour (unidirectional airflow)
ISO 6 90–180 air changes per hour
ISO 7 30–60 air changes per hour
ISO 8 10–25 air changes per hour
Conventional building 2–4 air changes per hour
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