The five louvre blades are 575mm wide twinwall polycarbonate glazing. This louvre vent is 635mm wide overall (25") which fits the majority of aluminium greenhouses. Louvre blade width 575mm (23"). 5 twinwall polycarbonate louvre blades.
Greenhouse Louvre Vent - 5 Adjustable Polycarbonate Blades 575mm Wide, Silver
Automatic Greenhouse Louvre Vent Opener from Bayliss
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