Air Circulation for Greenhouses & Indoor Growing Facilities

For our Leizig Air Circulation Fan review, we’ve been operating the 12-inch MODEL CF12 air circulation fan in our hydroponic greenhouse for over four months. The importance of maintaining consistent air movement in greenhouses and indoor growing facilities is well documented. Good airflow offers several key benefits, including:

• Even distribution of CO₂ around plant foliage for healthier growth
• Prevention of warm, humid air stratification near the ceiling
• Encouragement of plant transpiration for better development
• Creation of uniform temperature and humidity within the plant canopy
• Deterrence of pests and insects
• Strengthening of plant stems
• Prevention of moisture buildup on foliage
• Reduction of interior condensation or drip

The benefits of healthy air circulation extend beyond these examples and are essential for successful controlled environment agriculture.

Not All Fans Are Created Equal

The performance of industrial air circulation fans—especially in agricultural settings—relies heavily on design.

Blade shape and pitch affect airflow efficiency and coverage. Variable-speed motors allow growers to adapt air movement to changing conditions. Fan housing materials must withstand dust, humidity, and corrosive conditions common in greenhouse environments. Diameter and placement impact both air distribution and energy efficiency. Long-term performance also depends on low noise output and ease of maintenance.

Airflow Basics in Greenhouses & Grow Rooms

In most growing environments, the goal is to maintain a steady flow of air through the plant canopy. While simple in theory, achieving this effectively depends on fan quality and positioning.

In small indoor grow tents, gardeners often use residential oscillating fans. These can stir the air enough to prevent stratification but aren’t ideal for larger areas. Their short service life and tendency to accumulate dust can also lead to disease issues.

In our 12′ x 20′ poly gothic-arch research greenhouse, we’ve experimented with various fan types over the years:

• Floor Fans: Generally unreliable with poor airflow coverage. Bearings often fail with continuous use, making them costly to replace frequently.
• Inline Fans: Better reliability but poor for even air distribution in open spaces. They’re designed for ductwork and, when used openly, can be noisy and collect particulate in the housing, leading to maintenance concerns.

Leizig Air Circulation Fan Performance

The MODEL CF12 made a strong impression right out of the box. It’s clearly designed for professional environments. The heavy-gauge steel housing includes a non-restrictive safety guard that keeps airflow unobstructed and prevents debris buildup. The blades are large, aggressively pitched, and easy to clean—especially with the removable grate that allows simple access once the fan is powered off.

The mounting bracket is rugged, swivels easily, and attached securely to our steel greenhouse tubing. Due to the fan’s industrial-grade steel and motor, it does have some weight—but it’s manageable. Best of all, no wiring was needed—just plug and go.

Installation was fast, and when we powered it on, the results were immediate and impressive. One fan was more than enough for our 12′ x 20′ greenhouse with a 9.5-foot ridge height. Positioned near our motorized fresh air shutter, the breeze reaches the opposite end of the greenhouse—a full 20 feet away. Even across the 12-foot width, the plant canopy moves gently and consistently with the airflow, even in densely planted areas.

We also saw measurable improvement. Our multiple temperature and humidity sensors showed more even readings throughout the space. This suggests better overall air distribution, which helps improve both plant health and energy efficiency. When air is evenly distributed, heaters and dehumidifiers cycle only as needed—reducing “hot spots” and saving power.

Most importantly, the fan runs very quietly. There’s no excessive vibration or humming, which we attribute to the balanced blade design and double ball-bearing construction. Even after four months of continuous operation, the fan remains smooth, quiet, and reliable.

Final Thoughts

We’re happy to say that we are fans of this fan!Compared to the number of floor and inline fans we’ve gone through over the years—many not intended for greenhouse use—the Leizig MODEL CF12 stands out as a purpose-built solution offering excellent performance, quiet operation, and durability. We only wish we had found it sooner.

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