Hi Joseph, alright, the general rule of hand is that you need 400 CFM per ton of cooling. If we convert18.3 kW to tons with this converter, we get 18.3 kW = 5.20 Tons. That would yield an airflow of 400 CFM/Ton × 5.2 Tons = 2080 CFM. That would be 3534 CHM. Hope this helps...
kW To Amps Calculator: Convert Killowatts To Amps (+3 Examples) m3/h To CFM Calculator: Convert CMH To CFM (With 1-3000 m3/h Chart)