How much ventilation is required in the growroom?
To calculate how big a fan you will require: Simply multiply the length x width x height of your growroom in mtrs which will give you the cubic capacity of your room ..and then multiply that value by either 20 or 30 which is the minimum and maximum air changes required per hour for optimum ventilation in your growroom. For example: A growroom measuring 2mtrs x 2mtrs x 2mtrs = 8mtrs cubed x30 air changes an hour = 240mtr cubed per hour will need to be ventilated ..As a rule we recommend buying a slightly larger capacity fan than you need to allow for summer increases in temp and or using a Carbon filter. (30 air changes per hour are ideal for optimum ventilation).
