Juwel® Cold Frame Ventilator and Automatic Opener



Item # JAO
Ship Weight 0.90 lbs
Stock Status Out of Stock

Maintain your plants' optimal temperature automatically!

Add this ventilator to your cold frame and you won't have to worry about your tender plants. In warm weather this ventilator opens the window automatically and closes it again as soon as it turns cold. 12 lb. weight lifting capacity.

Product Information


Full opening to 17in., adjustable temperature control, use with Juwell cold frames, raises lids up to 12lbs in weight.


Manufacturer supplies a one year warranty.



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QUESTION: How does the JAO Opener work?
The piston has a heat sensitive gel inside which expands as the temperature in the cold frame rises, thus pushing open the hinged door of the cold frame.

Customer Reviews

Review Summary (Based on 1 Reviews)

Overall Rating: 4/5

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from MT

worry free ventilation


I bought my first automatic vent opener four years ago. I finally had to replace the piston last year. I have a total of four now and just ordered two more for a new coldframe this year. I learned to lubricate the piston for longer service after the first one failed. Please offer replacement pistons again. I haven't seen them in the catalog for three years. If you offer replacement pistons again, my rating will go up to five stars.