Cold Air Drain Frost Protection

How the Cold Air Drain® Works

How the Cold Air Drain® works.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.


#925   Cold Air Drain® 2-3 Acres*    Unit Size: 72in x 72in x 74in 843lb**
#1550 Cold Air Drain® 6-9 Acres*   Unit Size: 96in x 96in x 89in 1,100lb**
#3510 Cold Air Drain® 12-16 Acres* Unit Size: 125in x 125in x 114in 2,160lb**

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

Overview of the Cold Air Drain®A. PROPELLER:   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.

C. WIND TUNNEL HOUSING:   Computer-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.

Technical Specifications 


Convenience benefits of the Cold Air Drain®.CUSTOMIZED SYSTEMS!
For each project area, a Computerized Frost Analysis is offered, thereby eliminating much of the guesswork and overspending that often accompanies the purchase of frost protection.


This aesthetic, low profile unit is easily owner-installed and maintained.


Shur Farms Cold Air Drain® is stand alone frost protection, or may be used in conjunction with water, wind machines, and heaters to enhance their benefits. The Cold Air Drain® is available in 3 sizes (covering approximately 2-16 acres) and has numerous power options (tractor PTO, gasoline engine, electric motor, temperature controlled auto-start).


Unlike wind machines and sprinklers, the Cold Air Drain® can be run all night without causing damage during a winter freeze or changing weather conditions.  


Integrated forklift/tractor brackets provide complete portability for easy unloading and transporting in and out of the field.


Cost-effectiveness benefits of the Cold Air Drain®.LOW OPERATING COST!
Shur Farms Cold Air Drain® has the lowest operating costs of any active frost protection method. Most systems will have a 100% payback in the first year of operation.


The Cold Air Drain® is easily owner-maintained.


All Cold Air Drain® units are built on a metal skid and are freestanding. No cement pad is needed.


The Cold air Drain® arrives almost fully assembled and is easily put in place using a standard forklift or tractor.


The Cold Air Drain® evens out temperatures and bud break.



Sustainability benefits of the Cold Air Drain®.SAVES FUEL!
The Cold Air Drain® #1550 uses just approximately 1 gallon of fuel per hour. 


The Cold Air Drain® allows you to start frost protection irrigation systems later and turn off earlier, thereby saving water.


Quiet enough to be used near residential areas, businesses, and roads.


Power units and fuel tanks are low emissions and Environmental Protection Agency (EPA)-certified.


Ongoing research at the Shur Farms® facility and in the field is done to ensure quality products and services meet changing needs and regulations. Shur Farms Frost Protection® also works closely with growers, agricultural associations, academics, and government and nonprofit organizations to improve products, teach safe frost protection techniques, and help address local sustainability issues.