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VELUX offers a wide range of roof windows and skylights that vary in operation method, roof type compatibility, and features like double glazing for energy efficiency. The best option for you depends on whether you want ventilation, which roof pitch you have, and your budget.
The key difference between the VELUX GPL and GGL roof windows is the way they open. The GPL (Dual Action) window can open from the top or pivot from the center, while the GGL (Centre-Pivot) window only opens by pivoting from the center.
