Circular Fan
Circular fans (or HAF - horizontal airflow fans) in greenhouses provide consistent air movement, which creates uniform temperature and humidity, reducing heat stratification, preventing mold/disease, and promoting stronger plant growth. They save on energy costs by destratifying air and ensuring better CO₂ distribution for improved photosynthesis.
Key Benefits of Circular Fans in Greenhouses:
- Temperature Uniformity: They prevent hot air from accumulating at the ceiling, ensuring a consistent temperature throughout the greenhouse.
- Disease Prevention: Constant air movement prevents stagnant air, reducing humidity around plants and decreasing the risk of fungal diseases and mildew.
- Energy Savings: By breaking up heat stratification, they reduce heating costs by keeping warm air at plant level.
- Improved Photosynthesis & Health: Moving air ensures consistent
availability to leaves, while gentle, consistent air movement strengthens plant stems.
- Reduced Pests: Good circulation reduces the likelihood of pest infestation, as many pests prefer stagnant air.
- Effective Humidity Control: Fans help circulate air to better manage high moisture levels that can lead to plant stress
What Size Circulation Fan Do I Need?
1. Greenhouse area x 10 = fan cfm.
- Example: 8′ x 12′ = 96 sq. ft. x 10 = 960 cfm.
2. If your greenhouse if half full of plants, deduct 50% (960 x .5 = 480 cfm).
3. If your greenhouse is very full of plants, add 50% (960 x 1.5 = 1440 cfm).
