Rhino automatic roof vent opener. Will fit aluminium greenhouses (no drilling required, simply clamps to the frame) or can be screwed to the frames of timber greenhouses. Fitted with a very reliable cylinder for long life.

Rhino de luxe automatic roof vent opener. Double Spring. Detatchable. This autovent has a double spring to keep the vent securely held down in windy conditions. It also features a very useful quick release mechanism allowing the autovent to be unattached during cold weather or high winds so that the roof vent can be locked shut (by some other means). The cylinder is of very high quality for long life.

Rhino automatic louvre vent opener. This autovent will open and close a louvre vent, whether 5, 6 or 7 blades. Some drilling is required in order to fit this accessory.

Rhino 5 blade louvre vent plain aluminium. 4mm toughened glass blades. Provides essential low level ventilation to help prevent stagnant air and plant disease.

Rhino 5 blade louvre vent green finish. 4mm toughened glass blades. Provides essential low level ventilation to help prevent stagnant air and plant disease.

Rhino 7 blade louvre vent plain aluminium. 4mm toughened glass blades. Larger size for better low level ventilation to help prevent stagnant air and plant disease.

Rhino 7 blade louvre vent green finish. 4mm toughened glass blades. Larger size for better low level ventilation to help prevent stagnant air and plant disease.