*The current delivery lead time for most Palram Canopia® products is 3-5 working days, however remote areas may take a bit longer. Larger items will require specialist handling, and delivery will be extended slightly to 10 working days. Please see today’s stock availability information here.

Palram Canopia® | Greenhouse Automatic Vent Arm

SKU: 701338P
Opens roof vent automatically as the temperature warms for air circulation and heat relief, closes when the temperature cools Mechanic system, no baterries required. Adjustable opening from 12-15C. Suitable for all Palram greenhouses.


Palram – Canopia® Automatic Vent Opener

The Automatic Vent Opener was designed to automatically control the temperature and humidity levels and provide additional ventilation when needed, making gardening easier. As the air inside the greenhouse warms, the vent gradually opens to allow the correct amount of airflow into the greenhouse and closes when the temperature cools. The vent arm was designed with a metal cylinder containing wax which expands when heated to push a piston, which raises the window, as the air gets warmer, then contracts as it cools, closing with the use of a spring and resetting the piston.

All you need to do is to install it on your roof vent window and it automatically starts working. The Automatic Vent Opener operates without the use of electricity and is compatible with all Palram Canopia® greenhouse models.



  • Opens when temperature gets too hot
  • Closes when the air cools
  • Mechanical system – no batteries or electricity required
  • Adjustable opening temperature
  • Automatically responds to weather changes
  • No need to stay near greenhouse
  • Easy DIY assembly


Quality Construction

The Palram Canopia® Automatic Vent Opener is a quality product. It is fully mechanical and doesn’t require batteries or mains electricity.

Low Maintenance

The auto vent opener is designed to be a maintenance free product, and will give years of trouble-free use. Occasional oiling of hinged parts is recommended to avoid stiffness following prolonged periods of inactivity.