GARDMAN GREENHOUSE AUTO VENT WINDOW OPENER SOLAR POWERED AUTO TEMPERATURE CONTROL Easy clamp fitting means no drilling required. Comes complete with all fittings and instructions. Opens up to 45cm. Keep your greenhouse at the perfect temperature. No batteries required. Pair of. Ideal for 6x6 (or larger) aluminium greenhouse. Boxed, never used! http://www.amazon.co.uk/gp/product/B000QVSCKS?psc=1&redirect=true&ref_
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