4X Greenhouse Double Spring Automatic Window Opener Solar Heat Sensitive Garden Vent Agricultural Tools

Important Notice: 1. Automatic ventilation of greenhouse can not be used at temperatures above 50° (122 F)
2. Make sure that your greenhouse window opens normally
: Maximum height of the window opening about 45cm
The temperature of complete opening about 30° (depending on adjustment and load)
Maximum weight vents not more than 7kg/15lb, Opening temperature regulated 16° to 25°

Note
When 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 & Silver
Material: aluminium alloy

Package Contents:
4 x Automatic Window Opener kit

Only 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.