| Name | Description |
|---|---|
| Conversion from the hinged opening angle to hinged opening width | |
| Coefficient for hinged opening area according to DIN CEN/TR 16798-8 (DIN SPEC 32739-8) | |
| Calculation of the effective opening area | |
| Calculation of the equivalent opening area | |
| Calculation of the geometric opening area | |
| Calculation of hinged-opening area by rectangular windows, unspecified types | |
| Calculation of the projective opening area | |
| Conversion from the hinged opening width to hinged opening angle |