Walmeck Automatic Vent Opener Greenhouse Windows Opener Auto Vent Opener Sensitive Paint Spraying Iron Double Spring Vent Opener

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