Poly Convection Tubing 4 mil 30” 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: This item is custom cut and has a 5-7 day processing time before shipment.

Poly Convection Tubing 4 mil 30” Diameter (Per Linear Foot)


  • Clear polyethylene construction
  • Strong UV inhibitor makes it ideal for greenhouse use
  • Allows for maximum light penetration
  • Each tube is guaranteed to support the full cubic feet/minute output of the same diameter fan
  • 4 mil film is guaranteed for 1 year and the 6 mil film for 3 years
  • Custom hole punching allows air to be distributed to the users particular needs
  • 4 mil tubing is available in 12, 18, 20, 24, 30, and 36 inch inflated diameters
  • Custom punched tubing ships out in 5-7 days

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


Each piece of convection tubing has holes punched in an orientation that best suit the needs of the user. 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. Punch positions can be varied as shown in the above image to best suit the ventilation/heating needs of the user. 


The tubing is custom cut to specific lengths and comes in multiple diameters to conform to almost any air distribution requirement. It is also custom hole-punched to one of 5 different hole configurations.



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: 0.19 lbs (per linear foot)


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