Greenhouse Ventilation Window Opener, Roof Ventilation Window Opener, Central Wall-Mounted Opener, Suitable for Greenhouses, Factories, Warehouses

Specification:Condition: 100% Brand NewItem Type: Window OpenerMaterial: AluminiumOpening Force: 25kg / 55lbOperation Area: Start at 17-25℃ (63-78℉)Maximum Open: Full at 30-32℃ (86-90℉)Closing Force: 15kg / 33lb via heavy duty springSupport Bar Length: Approx. 34cm / 13.4inSpring Fixing Tool Size: Approx. 14 x 5 cm / 5.5 x 2 inWeight: Approx. 343g / 12.1ozPackage List:1 x Support Bar1 x Spring Fixing Tool4 x Slotted Screw2 x Small Cross Nail4 x Screws2 x Small Screw4 x Large Round Fixed Ring2 x Small Round Fixed Ring2 x Round Iron Ring1 x Instruction Manual

• 🏬【Aluminium Alloy】--- Made of high quality aluminium material, not easy to rust and durable in use.
• 🏬【Easy to Master】--- Universal, easy to install and use, suitable for any blind window, easy to use.
• 🏬【Automatically】--- The window opener automatically opens and closes as the temperature changes.
• 🏬【High Security】--- Spring and support bar provide additional protection against wind damage.
• 🏬【Fool-proof Installation】--- Easy fitting by clamps or screws provided, no batteries or electricity required.