Circulation Fans in Greenhouse Climate Control
Greenhouse circulation fans move air inside the structure so temperature and humidity stay more even from end to end and from canopy to gutter. They complement — they do not replace — exhaust fans and pad-and-fan cooling. ClimaSpan sizes horizontal-flow fans from bay spacing, crop height and target air speed, then quotes by project.
Equipment selection and scope are confirmed in a written quote after we review your greenhouse size, layout, crop and climate. We do not publish public prices or catalogue-only spec sheets on these pages.
Role in the climate system
- Horizontal-flow fans move air along the length of the greenhouse above the crop.
- They remix indoor air so temperature and humidity stay more even from end to end.
- They complement exhaust fans and pad-and-fan cooling; they do not replace air exchange.
- Most models accept on/off or variable-speed control from a climate computer or thermostat.
Selection points
- Share bay width, gutter height, crop height and hanging obstacles.
- We suggest fan count and spacing for a light, continuous breeze rather than a strong draft.
- Many vegetable and ornamental greenhouses aim for gentle continuous movement; exact targets are set from crop type when sizing.
- Models and quantities are confirmed only in a written quote.
How it pairs with structure and crops
- Useful in vegetable, ornamental and nursery greenhouses that need continuous air movement.
- Helps when heating or CO₂ enrichment needs even distribution.
- Mounting height should clear benches, troughs and hanging irrigation.
- Product details: see the greenhouse circulation fans page.
Related greenhouse systems
Circulation Fans product page
Full circulation fan overview.
Exhaust Fans (system)
Air exchange and cooling capacity.
Cooling Pads (system)
Evaporative intake cooling.
Climate Control hub
Full climate package.
Frequently asked questions
Where should circulation fans be mounted?
Usually along the length of the greenhouse above the crop, aimed to create a gentle horizontal loop. Exact height and spacing depend on bay width, gutter height and hanging obstacles.
Do I still need exhaust fans if I have circulation fans?
Yes for summer cooling. Circulation fans remix indoor air; exhaust fans exchange indoor air with outdoor air. Pad-and-fan cooling requires exhaust capacity sized to the greenhouse.
Can circulation fans run with a climate computer?
Most models accept simple on/off or variable-speed control from a greenhouse climate computer or thermostat. Share your controller type when you request a quote.
Where is the product page?
See the greenhouse circulation fans product page for the equipment overview.