NBS Source
List your products

This product is no longer available


Prefabricated, modular rooflight, with thermally broken aluminium profiles and an embedded polyurethane core. Supplied with fully framed panels, which provide support and edge protection for glass on all sides.

Features and benefits:

  • Smart design with slim, shallow profiles.
  • Allows maximum natural light into rooms.
  • Low profile depth of 74 mm.
  • Recyclable materials used.
  • Each panel can open without the need for extra framing.
  • Maintains low thermal transmittance (U-values), helping to control costs.
  • Gaskets sit between panels and at junctions around the perimeter of the glazing, providing a thermal and air-tight seal.
  • Durable and flexible aluminium is used.
  • Provides a natural ventilation system.
  • Can be tailored to suit project requirements.
  • A range of multi-coated solar control options are available.
  • Five-year warranty overall, two-year warranty for opening mechanisms.

Products can be single pitch or double pitch, and supplied as gables, hips, valleys, pyramids, and in-laid rooflights, in single or multiple tier. They can also be installed vertically.

CE marked in accordance with BS EN 14351-1, fully tested to EN 12101-2, Natural Smoke and Fire Ventilation, and tested in accordance with CWCT TN66/67, Impact Testing.

General information

Panel frame: Aluminium alloy 6060

Panel frame filling: Polyurethane

Gaskets: EPDM and TPE

Fittings: Grade 1.4301 (304) steel alloy

Uniclass 2015
Framed rooflights (Pr_30_59_72_31)Primary
Specification data - Framed rooflights
Product Reference

A74, Atrium mono-pitch, upstand/ lean-to

Single pitch, pyramid.

A74, Atrium mono-pitch, in-laid

Single pitch, vertical.

A74, Atrium double pitch, self-supporting

Double pitch.

Size -

260–2900 mm. Consult manufacturer and insert requirements.


260–1200 mm. Consult manufacturer and insert requirements.


Double glazed, low-emissivity insulated

Over-laminated safety units with warm edge spacers and Argon filled cavities.

Multi-coated solar control panels

Optional, consult manufacturer and insert requirements.

Triple glazed, low-emissivity insulated

Over-laminated safety units with warm edge spacers and Krypton filled cavities.

Colour/ Finish

Natural anodized

Powder coated, RAL

Consult manufacturer and insert colour requirements.



Can be inserted on every second panel. Consult manufacturer for module size requirements.

Not required

Standard product features

Profile size (d x w):

74 x 50 mm.


  • Panel frame: Aluminium alloy 6060.
  • Panel frame filling: Polyurethane.
  • Gaskets: EPDM and TPE.
  • Fittings: Grade 1.4301 (304) steel alloy.

Installation slopes:

  • Gabled, 25–60°: Single pitch rooflight.
  • Pitched, 15–90°: Double pitch rooflight.

Technical characteristics:

  • Weight of pane: 2.5 kg/m² (per mm of glass, up to 80 kg per panel).
  • Panel frame profile: 1.8 kg/m.
  • Thermal transmittance (U-value), double glazed (complete framed panel): 1.6 W/m²K.
  • Thermal transmittance (U-value), double glazed (glass): 1.1 Wm²/K.
  • Thermal transmittance (U-value), triple glazed (complete framed panel): 1 W/m²K.
  • Thermal transmittance (U-value), triple glazed (glass): 0.7 Wm²/K.
  • Gaskets: 50–70 shore.
  • Water tightness (to EN 12208): Class E 1200.
  • Air tightness (to EN 12207): Class 4.
  • Thermal insulation (panel, to EN 12567-1): 1.6 W/m²K.
  • Thermal insulation (joints, to EN ISO 10077-2): 2.9 W/m²K.
  • Thermal insulation (edges, to EN ISO 10077-2): 0.5–3.2 W/m²K.
  • Sound reduction: 34 dB.

Product Options


Maximum internal area of 2.0 m². Panel size depends on pitch and other static conditions, consult manufacturer for information.


Bespoke options available. Consult manufacturer for information.


Seamlessly integrated, without the need for extra frames. Provides natural ventilation without loss of performance. Up to 50% of panels can be opening vents, or easily turned into opening vents at a later date, ensuring the space is cool and airy when required.

Similar products from VELUX Commercial