Tubular skylights
Hatch lids
Openable skylights
Roof windows
Ventilation Chart for Skylights and Hatchlights
Sizes for Skylightsdirect and Barkley Fabrications Roof Windows and Hatchlights
Ventilation Recommendation for Skylight and Roof Window Sizes
Skylight Throat Size |
Spread of Light Size |
Recommended Room Size |
Opening Area (m2) |
Approx. Vent Area (m2) |
| 300mm dia | 1.2m dia | Walk in robe, toilet, cupboard | 0.9 dia | |
| 400mm dia | 1.5m dia | Walk in robe, toilet, cupboard | 0.135 dia | |
| 500mm dia | Small room or above breakfast bar | |||
| 400mm x 400mm | 1.8m2 | Ideal for bathrooms, toilet, WIR | 0.16 | 0.043 |
| 500mm x 500mm | 2.4m2 | Small rooms, study | 0.24 | 0.078 |
| 600mm x 600mm | 2.6m2 | Laundry, entries | 0.36 | 0.092 |
| 400mm x 600mm | 1.8m x 2.6m | Rectangular hallways | 0.24 | 0.066 |
| 600mm x 800mm | 2.0m x 3.6m | Over breakfast bar, or narrow rooms | 0.495 | 0.101 |
| 500mm x 900mm | 2.2m x 3.6m | Over breakfast bar, or narrow rooms | 0.54 | 0.103 |
| 600mm x 1200mm | 2.6m x 5.5m | Large rectangular rooms | 0.72 | 0.132 |
| 700mm x 700mm | 3.6m2 | Large square rooms | 0.49 | 0.105 |
| 775mm x 775mm | 4.0m2 | To light up lounge | 0.775 | 0.111 |
| 800mm x 800mm | 4.5m2 | Large room, family, lounge | 0.64 | 0.119 |
| 900mm x 900mm | 5.0m2 | Very large room eg. rumpus | 0.81 | 0.132 |
| 1.0m x 1.0m | 5.5m2 | Very large room eg. rumpus | 1.0 | 0.146 |
| 1.2m x 1.2m | 6.5m2 | Very large room eg. rumpus | 1.44 | 0.173 |
**Skylightsdirect trading as Barkley Fabrictions skylights and hatches have been fully tested by Australian standards at RMIT for strength and climate resistance. Compliance test RMIT/AS4285-1995, for watertight, resistance to concentrated loads and extreme wind.