Convection Tubes

Enerdes is the leading supplier of convection tubes worldwide. We have invented the double air distribution hose, which provides far better air pressure and air velocity conditions than conventional convection tubes.

We can supply many sizes and hole patterns on short notice. Our knowledge, flexibility, fast delivery times and personal attention make our patented convection tubes the best choice for your greenhouse!

HAF fans with air distribution hoses

The Enerdes expertise

Advantages Enerdes Convection Tubes for Greenhouses

Enerdes is part of the Reinders Corporation and has been developing and producing convection tubes for decades. We are the largest producer of air distribution systems worldwide. Enerdes convection tubes will ensure an even temperature and humidity distribution all throughout the greenhouse as well as air movement around the plants. 6 advantages of Enerdes Convection Tubes
  1. Patented air hose design Enerdes has invented and patented the double air distribution hose. They provide far better air pressure and air velocity conditions than conventional convection tubes.
  2. Optimized hole patterns The hole pattern on the air hoses can be adjusted to provide perfect air flow around your specific system. This increases product quality and crop yield.
  3. Ideal tube hangers Enerdes has designed its own perfect tube hangers that are durable, lightweight, UV-stabilised and minimally invasive to the air hose foil.
  4. Tailor-made Enerdes can deliver any size and hole pattern, to ensure the convection tubes are tailor-made to your greenhouse and the requirements of your crops.
  5. Fast delivery times We can deliver your desired product and amount with very fast delivery times.
  6. Experience Enerdes has experience since 1910 with every possible greenhouse climate control system. Our expertise enables us to provide our customers with the best climate system possible for their individual needs. Enerdes can also supply you with the worldwide leading greenhouse fans, to make your system complete.

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Unique Properties of Enerdes Air Hoses

All Enerdes air hoses come equipped with the following properties:

  • Patented design for optimal pressure distribution and air circulation
  • Perfect perforation pattern
  • Durable
  • Robust plastic
  • Very good tear resistance
  • Lightweight
  • UV-stabilised

Two types of air hose foil are available: transparent and white. Both are available in varying material thicknesses. The punctore hole pattern can be adjusted on request or optimized to your specific application. The best choice depends on the greenhouse climate and the customer’s application.

Other suppliers do not have the right to produce our patented DADH’s and can only deliver single air hoses that have a worse performance and are less energy efficient. They are mainly based in the USA. Enerdes supplies air hoses globally, including the United States and Canada:

  • Cropking
  • Agriculture Solutions
  • M. Leonard (Amleo)
  • Grower’s Solutions

What are Convection Tubes?

Convection tubes are plastic foil tubes made of polyethylene that can be filled with air. These tubes are installed in greenhouses in order to provide fresh air and air circulation to the crops. Some are unpunched for air transport. The tube foil can also be punched in specific patterns to provide optimal air distribution and air circulation around the crops. 

The tubes can either be placed in the top of the greenhouse to provide heating and cooling in a very energy efficient and cost saving way. Or they can be placed under the crop gutters, in order to provide moving air around the plants and improve moisture concentrations. 

This is how convection tubes work:

  1. A fan blows air into the air hose. This air can come either from outside or inside the greenhouse:
    1. Internal air. Circulating greenhouse air under the crop gutters prevents stagnant air near the plants. This provides an optimal moisture balance in the greenhouse and reduces diseases such as botrytis for the plants.
    2. External air. Circulating fresh air with the air hoses additionally allows for better CO2 balances in the greenhouse and an inexpensive but efficient way of heating or cooling the greenhouse.
  2. The Double Air Distribution Hose has a hole pattern that provides optimal pressure and air velocity. It has been engineered such that the air velocity and thus the air circulation will be equal over the whole length of the convection tube.
  3. Tube hangers allow the convection tube to be positioned in an ideal location in the greenhouse and will make sure the tube is not damaged. Enerdes has designed its own perfect tube hangers that are durable, lightweight, UV -stabilised and minimally invasive to the air hose foil.
  4. End caps are placed at the end of the air hose. This way the pressure distribution in the hose can be controlled as well as the air velocity at the end of the air hose. This can for example help with convection tube cooling in the greenhouse corridors.
Convection tubes air hoses Enerdes

Why do I need a Convection Tube System?

  • A convection tube system provides a lot of benefits to your greenhouse operation, ultimately improving the yield of your crops:

    • Energy efficient way of air ventilation, convection tube cooling and heating
      The poly convection tubing implements a uniform air distribution throughout the entire greenhouse and around all crops. 
    • Homogeneous temperature distribution
      Air mixing ensures better CO2 balances and a homogeneous temperature distribution around all plants. This results in constant and reliable quality of crops.
    • Improved moisture balance and humidity levels
      A proper convection tube system in a greenhouse improves the moisture balance and humidity levels. This enhances crop quality and reduces the risk of mold or plant disease development.
    • Elimination of stagnant air
      Convection tubes can provide a constant flow of fresh air and thus eliminate stagnant air, improve humidity levels, avoid dry and cold areas or hot and wet ones. This all results in a more consistent environment for your crops.

    In conclusion, installing a proper convection tube system in your greenhouse will increase product quality and crop yield and save you energy as well as money. It is an environmentally friendly and a cost effective investment.

Air hose Type:



Greenhouse Location




Crops will still receive 58 % of sunlight

Crops receive reflected sunlight


Easy to see when hoses need to be replaced

Harder to see, depending on greenhouse climate. Standard is once every year

Heat capacity



Fire Resistant- Flameproof Convection tubes Hoses from Enerdes

We are suppling air convection tubes across six continents. We can deliver our tubes/hoses in accordance with the requirements of:

  • NFPA 90A
  • UL 2518
  • UL-C
  • BS 5867 Part 2, 1980
  • GB8624-2006
  • DIN 4102-1
  • Punched holes

Terminology for Convection Tubes

  • Greenhouse accessory suppliers use different terms for similar products. At Enerdes we prefer the term Air Hoses and for our optimized and patented product: Double Air Distribution Hoses. Below is a list that all refer to air hoses for greenhouses:

    • Air duct
    • Air distribution duct
    • Air hoses
    • Convection tubes
    • Convection tubing
    • Jet tubes
    • Poly convection tubing
    • Poly ducts

Convection Tube Cooling

Convection tubes can provide a constant flow of cooling air which brings several advantages.

Some examples of the benefits of convection tube cooling:

  • Convection tube cooling is energy efficient
  • It is cost saving
  • It ensures a homogeneous temperature
  • Improves the humidity levels and moisture balance

Contact info

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