starting at $19.95
Automatic Vent Opener
Protect your greenhouse, cold frames and tunnels from overheating! This automatic vent opener is a great way to insure your plants do not over heat in you greenhouse or cold frame. Easily attaches to greenhouse vents and cold frames to automatically open when it gets to warm inside. The opener operates automatically and can be adjusted to open at temperatures between 60-77° F. No batteries or electricity needed.