Poly Convection Tubing 4 mil 20” Diameter (Per Linear Foot)

In stock

This custom cut Poly Convection Tubing is a lightweight, durable, and UV stabilized ventilation option that is ideal for greenhouses, warehouses, workshops and more. Priced per linear foot. Note: Custom punched tubing ships out in 5-7 days.

Poly Convection Tubing 4 mil 20” Diameter (Per Linear Foot)



  • Clear polyethylene construction
  • Custom cut to specified length
  • Strong UV inhibitor
  • Allows for maximum light penetration
  • Guaranteed to support the full cubic feet/minute output of the same diameter fan
  • 4 mil film is guaranteed for 1 year
  • Custom hole punching to one of 5 configurations
  • 4 mil tubing is available in 12, 18, 20, 24, 30, and 36 inch inflated diameters

Please note: This tubing has a minimum length of 100 feet, and a maximum length of 400 feet.

This transparent, polyethylene convection tubing is designed to effectively distribute air in greenhouses, barns, warehouses, workshops and more. It is UV stabilized to hold up against direct sunlight as well as damp conditions. This convection tubing is extremely lightweight and can be hung inside of practically any structure For use in heating applications, ventilation purposes, directional airflow and more.


Custom hole punching is available in one of five different orientations. The numbers associated with the hole punching options (8/4, 7/5, 9/3) indicate where the holes would line up to a clock face. So the 3/9 hole orientation directs air in opposite directions where a 7/5 hole orientation is a more directed approach.  A properly designed tube will make full use of the airflow provided by the fan or blower and helps to distribute the air evenly down the length of the greenhouse.

Installation Tips:

We recommend that tubing be hung from a cable using tube hangers. These hangers do not penetrate the plastic. They consist of a loop of white plastic and a snap ring. The tube loop extends around the outside of the tube and is clipped to the cable using a snap ring. The hangers should be spaced 7 feet apart. The convection tubing can also be hung with any soft rope or material that won’t rub or puncture the tubing

Suggested Uses for Convection Tubing:

  • For ventilation when cooling greenhouses
  • For uniform dispersion of heat from a forced hot-air furnace
  • For improved mixing of air in greenhouses
  • For the introduction of dry air into greenhouses
  • To provide gentle streams of ventilation air instead of harsh blasts of air
  • To heat selected areas of a greenhouse when the whole house does not need heat

Unit Ship Weight: 0.13 lbs (per linear foot)


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