in Texas, its either all the way open or all the way closed,,, we rarely have a day of weather that would require the walls to be half way.,.. but you could if you wanted to.
I'm planning some greenhouses with raised media beds on one side, rafts on the other, and intend to use drop down by the rafts to allow air flow over them without opening all the way. Thought I'd do roll up on the other to let air in under the raised beds without opening all the way.
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