Please note this is an INTEGRA (electric) flat roof window base only (kerb or upstand). INTEGRA flat roof window base The VELUX vented flat roof window provides ventilation and fresh air through the roof with electrical operation. Polycarbonate top cover Please note a polycarbonate top cover is required for use with this product to create a complete flat roof window system and is available in both clear and opaque. No chance of rain Weather problems? No problem! VELUX INTEGRA flat roof window CVP has a built-in rain sensor that automatically closes the window when it starts raining. VELUX flat roof windows It's amazing what adding a VELUX flat roof window can do for your home. Many living spaces in flat roof buildings - including kitchens, living rooms, and offices - get very little natural light. With a VELUX flat roof window, you can transform and improve virtually any space with daylight. Imagine what a VELUX flat roof window can do for your home: add natural light, increase fresh air and provide a fresh look to your interior. Available in open or fixed versions. Both can be used for new installations or as replacements for existing dome products. Great thermal and energy efficiency VELUX high-performance insulation is integrated into the frame to give the best possible protection against heat loss. This, combined with our optimised protection against thermal bridges, delivers a warmer, more comfortable home. Ease of installation This product can be installed quickly and easily.