Grow Room Ventilation

Exhaust Calculator

Calculate extraction fan size in m3/h and CFM based on room volume, duct losses, carbon filter resistance, and heat load.

Inputs

Length (m)Width (m)Height (m)

Air exchange (minutes)Duct length (m)

90° bendsHeat load

Carbon filter (+20%)Summer / high ambient temp (+15%)

267,080 m³/h

157,197 CFM

Suggested fan range: 227018 - 307142 m³/h

Room Volume

2880.00 m³

Base airflow (no losses)

172800 m³/h

101706 CFM

Carbon filter

x1.20

Duct losses

x1.00

Bends losses

x1.12

Heat load

x1.15

Seasonal

x1.00

Practical tip

For quieter operation, choose a fan around 15-30% above recommendation and run it with a speed controller.

Formula used

Base m3/h = (Length x Width x Height x 60) / Exchange minutes, then multiplied by pressure and heat factors.