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| Type | What it does |
|---|---|
| Skylight | Daylight and a view, opens for airflow |
| Roof vent | Extracts heat, cooking smells and moisture fast (12V fan) |
Many conversions fit one of each: a skylight over the living area, a vent over the kitchen or shower.

Also check the roof thickness range on the product page: 25 to 80 mm depending on the model.
Skylights · glazed
| Model | Cut-out (cm) |
|---|---|
| 40 × 40 | |
| 40 × 40 | |
| 50 × 70 | |
| 50 × 50 → 96 × 65 | |
| 38.5 × 38.5 |
Roof vents · 12V fan
| Model | Cut-out (cm) |
|---|---|
| 40 × 40 | |
| 28 × 28 · 32 × 32 | |
| 28 × 28 | |
| 36 × 36 | |
| 40 × 40 | |
| 28 × 28 · 34 × 34 |
It is an airflow that never fully closes: it keeps the air renewed, it is required for homologation by many approval bodies, and it holds condensation down. Look for the orange tag in the tables above.