Automatic Greenhouse Window Opener w/Double Spring, Solar Heat Sensitive Vent for Garden & Agriculture 2024 Greenhouse Double Spring Automatic Window Opener Solar Heat Sensitive Garden Vent Agricultural Tool Important Notice: 1. Automatic ventilation of greenhouse can not be used at temperatures above 50 (122 F)2. Make that your greenhouse window opens normallySpecifications: Maximum height of the window opening about 45cmThe temperature of complete opening about 30 (depending on adjustment and load)Maximum weight not more than 7kg/15lb, Opening temperature regulated 16 to 25NoteWhen you receive this item in summer, you need to put the black bar into the refrigerator not less than 5 minutes to make the cylinder retracted fully before you assembly this product.Color: Black & SilverMaterial: aluminium alloyPackage Contents:1 x Automatic Window Opener kitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.