Flat roof skylight SFF

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Overview
The light tunnel is a solution for spaces where installing a window is not possible (corridors, dressing rooms, interior bathrooms). The SFF model, with a transparent dome and a flexible light-transmitting tube, is designed for installation on flat roofs and delivers natural daylight into interior spaces. Daylighting performance depends on tunnel diameter, tube length, roof orientation and correct installation.

Natural light all day long
Daylight captured at the roof is transmitted through the flexible tube and diffused into the room via a ceiling diffuser, providing uniform illumination without sharp shadows. Available in diameters 350 mm and 550 mm, the SFF model reduces the need for artificial lighting during daytime.

Key features

• Suitable for flat roofs with pitches 0–15°
• Flexible light-transmitting tube (standard length 2.1 m) enabling routing around structural obstacles
• Transparent, UV‑resistant dome supporting water runoff and limiting dirt accumulation
• Ceiling diffuser (frosted) for even light distribution; optional SLO light kit for evening use
• Inner tube surface with reflective finish to preserve high daylight transmission along the run

Installation and adaptability
The SFF unit is supplied with an integrated installation base and complete installation kit. The flexible tube adapts to room layout without cutting or splicing modules; sealing tapes prevent light leaks. The assembly is airtight and requires no regular maintenance.

Notes on performance and extension
The standard flexible tube length is 2.1 m. Extension with additional SLM modules is possible up to recommended maximum lengths: 400 cm for the 350 mm diameter tube and 600 cm for the 550 mm diameter tube.

Technical specifications

• Model: SFF
• Type of sun tunnel: Domed for flat roof
• Type of flashing: None
• Roof type and material: For flat roofs
• Sun tunnel diameter: 350 mm (also available in 550 mm)
• Length of light-transmitting tube: 2100 mm (standard)
• Base height: 150 mm
• Roof opening size: 420×420 - 470×470 mm
• Type of light-transmitting tube: Flexible tube, internal reflective layer
• Dome material / roof section: UV-stabilised 3 mm polycarbonate
• Thermal transmittance (U-value): 350 mm - 2.0 W/m²K; 550 mm - 1.9 W/m²K
• Airtightness class: Class 4
• Resistance to downward loads: DL 2500
• Resistance to uplift loads: UL 3000
• Impact resistance: small hard body - no perforation; large soft body - SB 1200
• Watertightness: Compliant
• Product weight: 20.1 kg
• Package dimensions (W × L × H): 0.87 m × 0.86 m × 0.385 m
• Accessories included / available: Integrated installation base, installation set, dome fastening set, profiles mechanically fastening the cover to the base; optional SLO light kit
• Recommended roof pitch for installation: 0°–15°