Special Nonexistent Furniture
Part #: JU122
SKU #: JU1054

Juliana Greenhouse Ventomax Window Opener


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List Price: $60.66

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Arrives for Christmas to Seattle, WA 02108 (Change)


Product Details
Product Q&A
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With the Juliana automatic window openers you can be sure of an even temperature in your greenhouse day and night. To be continuously controlled from 62-73º F (17-23º C.


  • For use with glass-panelled greenhouses
  • Solar-powered opener
  • Allows thermostatic control of roof vents
  • Note: Take care to remove the cylinder during periods with frost as the openers may try to open the windows when the sun warms up the cylinders. If the windows are frozen, this may cause the cylinders to burst due to their demand for getting rid of their surplus energy.


  • Overall Width - Side to Side: 12 Inches
  • Overall Depth - Front to Back: 2 Inches

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Weights & Dimensions

  • Window cylinder is 12'' L
  • 12'' W x 2'' D
  • Overall Width - Side to Side: 12 Inches
  • Overall Depth - Front to Back: 2 Inches


Product Type: Window and door accessoriesCountry of Manufacture: Denmark

“Exactly how big of an attachment are we looking at here?” asked by Maria

"Hello Maria, the actual attachment is 12 x 2 and the cylinder is 12 inches long." Will E from Wayfair


“Could you please tell me what size carton this ships in?” asked by Deron

"Hi Deron, the box for the window is 14" x 3" x 2"." Will E from Wayfair

Still have questions about this product? We're here to help

When you buy a Juliana Greenhouse Ventomax Window Opener online from Wayfair, we make it as easy as possible for you to find out when your product will be delivered. You can check on a delivery estimate for the Juliana Part #: JU122 here. If you have any questions about your purchase or any other Greenhouse Accessories product for sale our customer service representatives are available to help.Whether you just want to buy a Juliana Greenhouse Ventomax Window Opener or shop for your entire home, Wayfair has a zillion things home.

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Return Policy

We want you to love it. If you don't, you may return your purchase within 30 days of delivery. All you need to do is visit our Self-Service Return Center for instructions. Return credits are issued within 24 hours once the item is received and inspected. Please note that shipping charges are non-refundable. The cost of return shipping will be deducted from your refund.

30-Day Return Policy
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Customer Reviews

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Average Overall Rating:
(based on 5 reviews)

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Excellent Quality

 from Washington

The window openers are a great quality for a great price. I am very happy with them. They were very easy to install!

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Nice to trust greenhouse won't overheat.

 from Spooner, WI

I have four of these installed in my new greenhouse and they have been working very well to open in the morning as temps rise and close at night. Nice to not have to be around to check.

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Works just the way I expected.

 from Eugene, Oregon– Verified Buyer

I turned an old shower on it's side to make a cold frame for starting my seeds. This works really well to open the door on hot days and close up again as the weather cools. I have no worry about the box overheating.

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Exactly what I wanted

 from Havertown, PA

This is an exact duplicate of the original item that came with my Greenhouse. After about 15 - 20 years the old one finally stopped working. I trust the replacement will give me equally good service.

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 from Nebraska– Verified Buyer

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OUR SKU # JU1054

This item is also sometimes listed under the following manufacturer numbers: JU122