Hi Karen and Bower, and thanks for your interest. I have a 4 x 12 foot lean-to greenhouse mounted on the south-facing wall of a garage. There are two automatic roof vents, and I've opened up a triangular vent at the top of the side at the end opposite from the door. (I know I need to get a ventilating fan for this opening.) The glazing is 6 mm clear twinwall polycarbonate with UV filter. The shade fabric when needed is under the roof, but outside the 12' wall. I'm growing in containers: regular indeterminates along the high wall, and dwarfs along the short wall.
Steve
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