Automatic Vent Opener Greenhouse Windows Opener Auto Vent Opener Sensitive Paint Spraying Iron Single Spring Vent Opener

Automatic Vent Opener】Greenhouse windows opener can open and shut your greenhouse window automatically to maintain the best growing and preventing your greenhouse from overheating. 【Wide Applicability】Single spring vent opener can be closed manually and easy to install, fit for most of aluminum frame greenhouse. 【Adjustable 】 is adjustable from 15-25℃ (60-77℉) by turning the cylinder, maximum opening at about 30℃/86℉ (depending on adjustment and load). 【Iron Construction】Durable a