AT FILMS | POLYETHYLENE FILM COVERINGS
1. Sunlight strikes the earth, which radiates heat as infrared rays.
2. Regular greenhouse film trap some of the heat.
3. Thermal greenhouse film traps more heat.
Save Energy Dollars with Thermal Films
The greatest energy loss in a greenhouse is through conduction and the greatest savings are realized with a double layer glazing system, such as the typical inflated double poly house. Studies have shown that a properly inflated double poly house can save over 40% in fuel costs compared to a single layer glazing.
What you may not realize is that an additional 15%-20% can be saved by using a thermal film as one of the layers. Thermal films lower energy costs by reducing the radiant heat loss from the greenhouse, acting as a shield between your warm plants and the cold night sky. Since the radiant heat loss is reduced, heaters cycle less often and burn less energy to maintain their set point temperature. Thermal films should be installed as the bottom layer of a double poly system to take advantage of the anti- condensate properties. Although there is no harm in using two layers of thermal films, a second layer of thermal film doesn't add significantly to the energy savings.
Dura-Film® Thermax
Every grower strives to produce the best crop they can while keeping production costs to a minimum. AT Films' Dura-Film Thermax greenhouse poly combines all of these extras into one package. Superior drip control, energy savings, and bee compatibility are all packaged together to provide growers with one film at one cost.
Dura-Film® Thermax is available in a selection of stock sizes and is available during certain "runs or campaigns" at predetermined widths without minimums. All other widths are considered custom product.
Prepaid freight on 2,500-pound order. Custom Widths
The following minimums apply for custom widths on Dura-Film®
Thermax™ products:
• For widths of 20' or less, a minimum of 2,000 pounds per order, per width, and per gauge is required • For widths greater than 20', a minimum of 5,000 pounds per order, per width, and per gauge is required
How thermal films work: During the day in a greenhouse, the sunlight – comprised of both visible light and short wave infrared light – is absorbed by the plants, soil, and materials of construction, which results in them heating up. During the night, all objects that have absorbed this energy from the sun will release it as long wave infrared radiation. A thermal film will absorb and reflect this energy, keeping its warmth within the greenhouse environment, resulting in higher nighttime temperatures within the greenhouse.
Crop response to thermal films: AT Films Inc. thermal films will often have an effect on crop performance. Many growers report earlier color and/or compact plants. This is most likely due to the increase in nighttime plant tissue temperature associated with reduced radiant heat loss. While these effects are subtle, you should expect crop development to be slightly accelerated when using
DuraFilm®4 Thermal AC. Item # Dura-Film Thermax Sheets — Stock Sizes
47-1477A 4 Thermax 6M 24’ X 100’ 47-1481 4 Thermax 6M 32’ X 100’ 47-1483 4 Thermax 6M 40’ X 100’ 47-1483J 4 Thermax 6M 40’ X 150’ 47-1485 4 Thermax 6M 42’ X 100’ 47-1500 4 Thermax 6M 48’ X 100’ Item #
Price Dura-Film Thermax Tubes — Stock Sizes
47-1476 4 Thermax 6M 20’ X 100’ Tube 47-1520 4 Thermax 6M 24’ X 100’ Tube 47-1520J 4 Thermax 6M 24’ X 150’ Tube 47-1477K 4 Thermax 6M 24’ X 155’ Tube Campaigned Standard Width Sizes
Sheet: 10, 12, 16, 20, 24, 28, 32, 40, 42, 48, 50 Tubes: 14'4", 20, 24, 25
$249.64 $332.85 $416.06 $624.09 $436.87 $499.28 Price
$416.06 $499.28 $748.91 $773.87 MIL
6 Custom Lengths: 75’ minimum in length; 5’ increments only
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