Fan Size Calculator
Your space
Lights
Carbon filter
Ducting
A rough guess is fine.
You need a fan rated at least
— L/s
Sized so your fan cruises at ~75% speed — quieter, cooler, lasts longer.
How the fan size calculator works
The calculator starts with your grow space's volume and targets a full air exchange roughly once per minute. It then adjusts for HPS heat, carbon filter resistance and ducting losses, and builds in headroom so your fan cruises at around 75% speed instead of running flat out. Every fan it recommends is stocked in Australia and matched to your numbers, so what you see is what you can actually buy.
Browse the full range of inline & exhaust fans, or pair your fan with a carbon filter to keep odours under control.
