10 of 10 people found the following review helpful
Works well but poor instructions,
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This review is from: Automatic Greenhouse Vent Opener (Garden & Outdoors)So far the vent works exactly as intended. I'll give five stars if it's still doing so next year.
The vent was easy to assemble but fixing it to the greenhouse window could have been better explained.
The basic principle is that when the window is closed the two arms should be roughly parallel to the glass. To achieve this you must fix the lower clamp mount as high as possible (using the lowest possible pair of holes in the mounting plate).
The other point to note is that the clamping screws are very short (to avoid them touching the glass) and you will almost certainly drop one or two while making adjustments, so put a piece of newspaper on the greenhouse floor to catch them or they may be hard to spot!