The required air volume depends on the room usage,created contamination and heat in the room.While choose the ventilation fan,should consider min air volume per person needed and the air exchange frequency. Ventilation Selection Calculation Required products quantity will be calculated as below: Required product Qty=Required air flow volume(m³/h)÷Air flow volume of selected product(m³/h) Two methods to calculate the required airflow volume(m³/h): 1. Calculated by the times of required air exchange per hourV=RV*NRv:room volume(m³)N:times of air exchange per hour(t/h) 2.Calculated by required airflow volume to each personV=PV*PPV:volume of needed air to each person person (m³/h)P: number of...