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About the Cold Air Drain®



All aluminum construction, balanced, jig-formed

to provide complex contour needed for high

aerodynamic efficiency.


B. GEARBOX:  ISO registered (International

Organization for Standards), AGMA Rated

(American Gear Manufacturers Association),

high efficiency right angle bevel gearbox, cast

iron housing, aluminum caps, carburized and

case hardened gears.



designed 8-panel model, CNC (Computer

Numerically Controlled) manufacturing, all steel

construction, bell inlet specially designed to

deliver maximum thrust to propel cold air.


D. BASE: All steel freestanding base,

precision engineered tower supports designed

to reduce movement and vibration in tower,

cold roll steel shafts with keyways, precision

ball bearings with cast iron housings for quiet

and smooth operation, quality industrial grade

#5 fasteners, electrostatic spray powder coating.


E. LIFT BRACKETS: Integrated forklift/tractor brackets to provide complete portability for easy unloading and transporting in and out of the field.


F. DRIVELINE: Balanced 3-piece design, industrial universal joints, safety orange plastic guards, 1 3/8in spline standard tractor PTO yoke, stabilizer bearing, keyway, and set screw.

Cold Air Drain® Overview




          #1550 Cold Air Drain®            6-9 Acres*   Unit Size: 96' at base x 116' at skirts x 90' tall          1,100 lb**

          #3510 Cold Air Drain®        12-16 Acres*   Unit Size: 130' at base x 152' at skirts x 119' tall      2,160 lb**


*Depending on severity of situation.
**Weights are approximate.




Radiation frosts occur during clear, cold nights with no wind. The ground loses heat stored during the day allowing an inversion layer to develop. In an inversion, the warmer air layer sits above the cold air layer that is closest to the ground.


During a radiation frost night, the heaviest cold air molecules flow downhill, like water, due to gravity. This cold air settles in low elevation areas that do not allow for adequate drainage. As the cold air accumulates in an area, frost damage occurs.


The Cold Air Drain® thrusts the cold air upward to a height of nearly 300ft (91.44m). As the coldest air is being sent up, it collects and mixes with the warmer, lighter air from above.  This helps to give the cold air continuous lift and allows it to rise higher, until it is dispersed into the upper inversion layer. The coldest air layer is drained and will not fall back down.  


The Cold Air Drain® effect changes the temperature in the lower elevation, frost-prone areas to be more similar to the temperatures in the higher elevation, non-frost areas. The grower may expect a more consistent yield in the lower and higher elevation areas.

How the Cold Air Drain® Works

© Copyrighted 2010 by Jackrabbit Equipment

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