Fan Size Calculator

Choose the best fan for your room

Why these fans?
Air should exchange roughly every 2 minutes for a standard grow room with low plant count & normal light levels.
For high-performance setups with intensive lighting and higher plant count, air should exchange roughly every 30 seconds to maintain optimal CO2 levels.
Choose the fan based on your setup.
If you tick the 'carbon filter box' the calculator will account for a 40% reduction in airflow, please note that extra long runs of ducting or excessive bends in ducting will further reduce airflow.