Jack-Store Solar Heat Sensitive Automatic Thermofor Window Opener Greenhouse Autovent Vent Opener Standard - Lifts 15 Lbs<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>100% brand new and high quality.</li><li>Non Electric， uses solar energy， open or close the greenhouse vents as temperature rises or drops.</li><li>Simply opens and closes when the temperature changes.</li><li>Maximum opening : about 30°， depending on adjustment and load ./Maximum window opening : 45cm.</li><li>Suitable for most greenhouses.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/61XmitOLEXL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41ob5BiOhNL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/419hXYbe%2BJL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51jYzBeVEhL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41HLL6vPdfL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31v-GcXU-8L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41Ad7OQhWoL.jpg" noproxy>