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Maximum sizes for Roof windows and sashes vary by width, height, wind zone and glazing requirement. Your local fabricator will be able to advise whether a configuration is possible. As a guide fixed window panels up to 1500mm by 1000mm width are attainable, however, constraints within the NZ Building Code or NZS4218:2009 may restrict the maximum size.
Opening roof windows are normally operated using winding gear which can be manually or electronically operated and can include such options as rain sensors so roof windows can close automatically when rain is detected.