For all orders exceeding a value of 100USD shipping is offered for free.

Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.

Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.

【No Electric Power Needed】The spring greenhouse window opener does not require batteries or electricity, as the indoor temperature and air pressure rise or fall, it automatically opens or closes the greenhouse's vents, which maintains the optimal temperature for plant growth.

【High Quality Material】Greenhouse winder opener is made of high quality of aluminum and stainless steel. and convenient to use.easy to install,Screw directly into polycarbonate panels, wood, or metal frames.

【Application】Maximum window opening approximately 45cm/18'', depending on adjustment and load. Window roof vent opener Suitable for greenhouse window up to 7kg (if more than 7kg, we recommend you to use two window opener).

【Overheating Protection】When temperature 25°/77°F, the window opener will keep opening.Fully open temperature at 30° (86°F) or once temperature drop to about 15°/59°F, the window opener will totaly close.

【Strong Force】Do not apply excessive loads by locking or covering window.The automatic ventilation window opener in the greenhouse cannot be used in an environment with a temperature higher than 50°.It is suitable for your greenhouse window, wall and hobby vents in higher wind situations.