1.For greenhouse ventilation
2.Fully automatic vent opener
3.Cheap greenhouse vent
4.Get the fresh outside
5.Automatic item

1.Fully automatic greenhouse ventilation
2.Heat activated
3.Fully adjustable to open between 15-25 °C(60-77 °F)
4.Open window fully to 450mm
5.Suitable for windows up to 7kg
6.Easy fitting by clamps or screws provided
7.No batteries or electricity required