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20 May, 2017
Automatic Side Louvre
1 of 1 found this helpful This is an essential product for greenhouse ventilation. I installed 2 for my greenhouse, 8'x12'.
Installation was easy & instructions were easy to follow. The spring tension on the arm was very strong, I felt, so I relieved one of the pair of springs. The tension with one spring is adequate for closing the vents and might add to the life of the cylinder.