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8.1 Kitchen system exhaust directly outdoors and has a continuous rate ≥ 5 ACH based on kitchen volume (Recommended ≤ 1 sone) or an intermittent rate ≥ 100 CFM and if not integrated with range, also ≥ 5 ACH based on kitchen volume (Recommended ≤ 3 sones)

See the following guides for relevant information.