SIS Frost Fan

Efficient, Ground-Level Frost Protection Built for Harsh Conditions

Frost poses one of the most significant risks to agricultural productivity, impacting crop quality, yield and long-term financial stability. According to the Australian Government’s Rural Industries Research & Development Corporation (now AgriFutures), frost damage costs Australian growers more than $300 million annually, with the heaviest losses occurring in low-lying areas where cold air naturally pools. In response to these challenges, RGB Industries has engineered a smarter, more efficient solution: the SIS (Selective Inverted Sink) Frost Fan.

Unlike traditional pedestal-style frost fans mounted high above the crop canopy, the SIS Frost Fan operates at ground level—where frost actually forms. By targeting the problem at its source, it delivers a more precise, energy-efficient, and cost-effective approach to frost mitigation. With more than 2,000 installations worldwide, including Australia, New Zealand, Canada, Chile and the United States, it is a proven system trusted by growers across varied climates and terrain.

Why Choose SIS Frost Fans?

The SIS Frost Fan is specifically engineered for real-world agricultural conditions, offering dependable protection on both flat and undulating landscapes. Each unit provides:

Up to 3 hectares of frost protection per fan

Ground-level operation to remove frost where it forms

Efficient performance in basins and low points

Low noise levels and minimal maintenance

Durable Australian-made construction

Easy transport on trailers, quad bikes, or farm vehicles

This versatility makes it ideal for vineyards, orchards, and frost-prone agricultural properties of all sizes.

How the SIS Frost Fan Works

Frost behaves like a liquid: it flows downhill and collects in hollows, gullies and depressions where cold air settles. The SIS Frost Fan is designed to sit directly in these natural or engineered basins. As horizontal blades rotate at approximately 300 RPM, the fan draws dense cold air from the ground and pushes it upward into the atmosphere. Warmer air then flows down in its place, preventing the formation of frost on fruit, buds and young shoots.

This ground-level selective inversion is both highly targeted and highly efficient, offering superior protection compared to traditional elevated fans that attempt to mix air from above the canopy.

Optional Automatic Operation

For growers managing large properties or multiple SIS units, an automatic start system is available. This upgrade allows the fan to start and stop without manual intervention.

Starts automatically at +2.2°C

Stops once conditions return above +6.2°C

Alerts for:

Fan start/stop

Low oil levels

Fault conditions

This feature is ideal for remote properties or for growers who want peace of mind during cold overnight conditions—without needing to be physically present.

Built to Last

Applications

SIS Frost Fans are ideal for a wide variety of crops, including:

Grapes

Cherries

Apples

Almonds

Avocados

Blueberries

Citrus

Pears

Persimmons
…and many more fruit and nut varieties vulnerable to frost.

Made in South Australia. Used Around the World.

Each SIS Frost Fan is proudly manufactured at our facility in Lonsdale, South Australia, using locally sourced materials and engineered components. With global installations and proven success in harsh and varied climates, you can trust RGB Industries to protect your crop investment season after season.