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Mk7 Triple Spring Autovent (silver)
The Mk7 Triple Spring Autovent Uses The Same Mechanism As The Mk7 But With Two Additional Springs Giving Extra Closing Force. Ideal For Top Hinged Side Windows, Light Roof Vents (like Upvc Windows) Or Roof Vents In Very Windy Areas.available In Silveropens Approximately 30cmsupplier Offers 2 Year Guarantee On All Replacement Cylinders But They Should Last Approximately 6-10 Yearsautomatic Openers Work By Wax Within Their Cylinder Expanding When Its Hot, Pushing A Piston To Open The Window And Contracting In Cooler Temperatures To Close The Window Again
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