How many units needed
The charts below should be used as a general guideline for how many Solar Roof Fans are needed for residential installations based on square meters and roof pitch. Several factors can effect the amount of roof ventilation units needed. Variables such as vaulted ceilings, attic shape, pitch and obstructions must all be taken into account when calculating the amount of attic venting needed.
About 18 degrees, or 4/12
| Roof Space | Unit(s) required |
|---|---|
| 74 sq.m | 1 x 10W |
| 110 sq.m | 1 x 10W |
| 150 sq.m | 2 x 10W or 1 x 20W |
| 185 sq.m | 2 x 10W or 1 x 20W |
| 220 sq.m | 3 x 10W, or 2 x 20W |
About 30 degrees, or 8/12
| Roof Space | Unit(s) required |
|---|---|
| 74 sq.m | 1 x 10W |
| 110 sq.m | 2 x 10W or 1 x 20W |
| 150 sq.m | 2 x 10W or 1 x 20W |
| 180 sq.m | 3 x 10W or 2 x 20W |
| 220 sq.m | 2 x 20W |
About 45 degrees, or 12/12
| Roof Space | Unit(s) required |
|---|---|
| 74 sq.m | 2 x 10W or 1 x 20W |
| 110 sq.m | 2 x 10W or 1 x 20W |
| 150 sq.m | 3 x 10W or 2 x 20W |
| 180 sq.m | 2 x 20W |
| 220 sq.m | 3 x 20W |