CFM calculator — room airflow — Sim your flow

Calculate the airflow a room needs from volume and ACH. Results in CFM, m³/h and L/s. Free CFM calculator in the browser.

How much air the room actually needs

Volume is the size of the room. ACH is how often you want the air replaced. Together they become a flow you can compare with the box rating — then open in Home to see if that flow works in practice.

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