| 414, Glazed-in louvre | 33 | 45 % | 59 % |
| 414R, Round glazed-in louvre | | 41 % | 59 % |
| 414VA, Controllable glazed-in louvre | | - | - |
| 414D, Controllable glazed-in louvre | | - | - |
| 414THF, Thermally insulated glazed-in louvre | | - | - |
| 415, Glazed-in louvre, with chevron section blades | 20 | 39 % | 93 % |
| 415R, Round glazed-in louvre, with chevron section blades | | 39 % | 93 % |
| 415VA, Controllable glazed-in louvre, with chevron section blades | | - | - |
| 424, Glazed-in louvre, heavy-duty series | 50 | 49 % | 70 % |
| 428, Glazed-in louvre, with chevron section blades, heavy-duty series | 95 | 43 % | 59 % |
| 425GL, Glazed-in louvre, extra-heavy-duty series | | 55 % | 86 % |
| 427GL, Louvre, extra-heavy-duty series, with adjustable blades | | 53 % | 88 % |
| 483, Glazed-in louvre, heavy-duty series, high-airflow | 60 | 76 % | 90 % |
| 484, Glazed-in louvre, heavy-duty series | 50 | 60 % | 70 % |
| 494, Glazed-in storm louvre | 50 | 26 % | 57 % |
| 327/1, Louvre with glass blades, single glazing | | - | - |
| 327/2, Louvre with glass blades, double glazing | | - | - |