NB: VELUX recommends FCM is installed with a slight pitch (e.g. 3°-5°) to help prevent condensation build-up and water ponding on the glass. **FCM 2270 not recommended for “landscape” orientation. #Custom made collar adapter (not supplied) is required to fit. †U-value (W/m2K) and SHGC data based on AFRC simulations, (FCM complete skylight: size 1275mm x 1275mm). ^Skylight only. Custom-made flashing required. Roof pitch 0°-60°.