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 air flow into the greenhouse and closes when the temperature cools. 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 greenhouse models only.
- Calibrated spring tensions
- Resists wind damage when opening or closing
- No need for electricity or controllers
- Strong, durable, corrosion-resistant components
- Works only with the Snap N Grow models HH #5121- 136, -137, -149 and Nature Series HH #5121-622, -623