Price: $65 - $70
AVAILABILITY:
Availability: In Stock - Usually ships in 1 to 2 days.
BAYLISS MODEL:

These Bayliss MK7 openers have three heavy-duty springs which gives the opener superior closing power making it ideal for side wall vents and roof vents in windy areas. Opening temperature is adjustable (Ranges shown below). Maximum opening of 12" is reached at approximately 20° to 30°F above opening temperature. Bayliss MK7 vent openers are made from the best corrosion resistant materials: stainless steel, anodized aluminum, and brass. These are recommended for use with Cross Country greenhouse vents. Powertubes are interchangeable.

Bayliss MK7 vent openers are available with 2 different models. The only difference is the operational temperatures of the powertube. The Orchid Wax model allows you to heat the greenhouse to higher temperatures for tropical plants in cold weather.

Bayliss MK7 Features

  • Adjustable temperature range:
    - Standard initial opening temperature range: 55° F to 70° F
        (Recommended for most applications)
    - Orchid Wax initial opening temperature range: 75° F to 90° F
        (Heating to high temperatures in winter)
  • Maximum opening of 12"
  • Recommended for vents up to 18 lbs.
  • Equipped with 3 heavy duty springs for windy locations
  • Made in the United Kingdom


How does a Greenhouse Autovent work?
A strong metal tube contains a mineral wax which expands with heat. This pushes a piston which opens the auto vent via a balanced linkage. As the temperature drops, the wax shrinks and a strong spring closes the vent and resets the piston.


Product Manuals, Tips, Specs, & Guides

Bayliss MK7 Vent Opener Dimensions
Bayliss MK7 Vent Opener Installation Manual


Item # 8040105, 8040106

Overall Customer Rating of 18 Reviews:
review-star review-star review-star review-star review-star

happy venting

Rating:
review-star review-star review-star review-star review-star
Put this in a small greenhouse with light weight roof panels. Works wonderfully.

Works well

Rating:
review-star review-star review-star review-star review-star
Works very well in my homemade greenhouse. The closing springs are very strong.

California

Works Perfectly

Rating:
review-star review-star review-star review-star review-star
Madam's Woman cave also known as he Orchid greenhouse needs these as the outside temperature range from 40 degrees F to 100 degrees F on the same day. They work perfectly opening and closing the vents as needed.

Great Auto-vent openers!!!

Rating:
review-star review-star review-star review-star review-star
Well made! The holes did not align with the old ones so new ones had to be drilled to fit the new vent openers, but this is to be expected. The vents work great and if the quality is the same as the old ones that I replaced, then it will be another twenty years before I have to do it again!!! Very satisfied!!!

Southworth, WA

Expensive but worth it (Bayliss MK7 Triple Spring Auto Vent Opener)

Rating:
review-star review-star review-star review-star review-star
Our first opener worked so well, we purchased a 2nd one--our greenhouse has two wooden gable windows on each end and we needed some additional airflow. Both of them work well. We like that they were very easy to install and can be adjusted to open sooner or later (depending upon the temperature). Initially we were a bit concerned if our windows would be too heavy for the opener, but this hasn't been an issue.