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Automatic Vent Opener - Standard - SEF110

Automatic Vent Opener - Standard Automatic Vent Opener - Standard Automatic Vent Opener - Standard Automatic Vent Opener - Standard


Cold Frame and Hotbed Gardening

Cold Frame and Hotbed Gardening

  • In stock. Ships from our warehouse in Northern California.

Use on Coldframes or Greenhouses

Ingenious temperature-sensitive device that automatically opens and closes coldframe lids, greenhouse windows and even skylights. Works throughout the day and maintain a constant interior climate, something impossible to achieve by manual adjustments.

  • Requires no batteries or electricity.
  • It can be adjusted to start opening between 60-77°F. Fully open at 86-90°F. Fully closed at 55°F.
  • Strongly recommended for all our glazed season extenders because it dramatically improves plant growth.
  • The hydraulic cylinder comes with a 1 year warranty. The average lifetime of the cylinder is 5-10 years, although some can last up to 20 years.

Replacement cylinders are available.

Screw directly into polycarbonate panels, wood, or metal frames. The Standard Vent Opener can open a hinged window or vent weighing as much as 32 lb. For larger panes use the stronger Gigavent with all metal construction, to lift up to 65 lbs.

Note from the manufacturer: It is not necessary to remove the cylinders during the winter. Recommended to lubricate the piston rod yearly, this will help extend the lifetime of the hydraulic cylinder. Don't use solid grease, as dust particles "glues" easily onto the piston rod and can damage the rubber. Also do not forget to unlock the vent in the winter if leaving the vent openers installed. Even a even a weak winter sun can heat the hydraulic cylinder sufficiently to make it start pushing the piston rod outwards.

Customer Reviews


I ordered two of these vents and one is functioning well but the other one has been ripped apart by it's own strenth. Totally severed the aluminum weld that the crosspin is attached to. I can'y see why it would have happened.

Review by (on )
Agree with everything said but one caution

We have 2 in our 8X16 and I agree with earlyer comments. Just one caution We live in an area that is windy at times. I would install a small link chain that would limit the max opening of vent to just where it stops opening itself. Our's would pull out of the cylinder as the wind grabbed the vent. It would then flap in the breeze which could damage the vent.

Review by (on )
Excellent Tool!

Easy to install (after analyzing the instructions carefully), functions smoothly and efficiently. Has already proven to be invaluable in growing early season plants.

Review by (on )

Bought one of these 8 years ago and it's still growing strong. Absolutely essential cold frame accessory for high altitude gardens where sun is intense but nights are cold.

Review by (on )
'Love em!

I've had two of these on a cold frame and it's the difference between success & failure. Prior to installing them, we'd either forget to open the cold frame, and our things would cook. Or we'd likewise forget to close the cold frame, and things would freeze. This little gem of automation picks up where we leave off.<br /><br /> pax<br />*----->

Review by (on )

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March 27, 2015 - Suzanne at Peaceful Valley
Dreaming of summer melons, cucumbers, peppers or tomatoes? Many of us are and getting impatient and want to start working out in the garden and getting our hands dirty! Well good news, there are a lot… read more »
September 7, 2012 - Charlotte from Peaceful Valley
Warm up your cold frame with help from your friendly neighborhood horse. Horse manure will raise the temperature in a cold frame, and our automatic vent openers will keep the cold frame from over-heating.… read more »
February 8, 2011 - Amber
With the recent warm spell of the past week and a half, at my house, we are in full swing production of seedling transplants in order to plant as soon as the last frost date occurs. The weather has been… read more »

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