Calculate CFM (Cubic Feet per Minute) needed for proper ventilation based on room volume and air changes per hour.
Cubic Feet per Minute
CFM (Cubic Feet per Minute)measures the volume of air moved by a fan or ventilation system each minute. It's the standard unit for quantifying airflow in HVAC and ventilation systems.
Proper CFM ensures adequate air circulation, removes indoor pollutants, and maintains healthy indoor air quality. The required CFM depends on room volume and how quickly you want to refresh the air (air changes per hour).
Low traffic, sleeping area
Regular family activity
Cooking odors, moisture
High humidity control
May have moisture issues
Vehicle emissions
CFM = (Volume × ACH) ÷ 60Length × Width × Height
How often air refreshes
Hours to minutes
Undersized systems can't adequately ventilate. Oversized wastes energy and money.
Energy recovery ventilators (ERVs) reduce heating/cooling costs while providing fresh air.
Ensure proper airflow to all rooms. Blocked vents reduce effectiveness.
Clean or replace filters regularly. Clogged filters reduce airflow significantly.
Cubic Feet per Minute - air volume flow rate
Air Changes per Hour - how often air is replaced
Liters per second - metric air flow unit
Energy Recovery Ventilator
Standard CFM - at standard conditions
Air resistance in ductwork