TLR 10" (25cm) or 14" (35cm) diameter rigid tunnel. Exterior flat glass window appearance. Easy to clean coating keeps glass cleaner for longer. Easy to install with integral flashing to suit slate up to 8mm thick. Double layer ceiling diffuser with new Edge-Glow technology increases the spread of light. Can be used for night time lighting with an optional low energy light kit (ZTL 014). Recommended for tunnel length 0.9m-6.0m (1.85m of tunnel supplied, additional length made up with ZTR Extensions) Suitable for roof pitches 15-60°