length   height
| 279 | PREFIX N - 508 PREFIX ZN - 628 | | | 
| 
| | | | 292 | | NG1 ZNG1 | NG5 ZNG5 | | | | 457 | | NH1 ZNH1 | NH5 ZNH5 | | | | 628 | 
| 
| 
| 
| 
| 
| NE6F | NE1 ZNE1 | NE5 ZNE5 | NES1 ZNES1 | NL1 | NE5F ZNE5F | | 
| 
| 
| 
| | 
| 923 | NC6F | NC1 ZNC1 | NC5 ZNC5 | NC5F ZNC5F | | ZNC5H | 1067 | | NC01 ZNC01 | NC05 ZNC05 | NC05F ZNC05F | | | 1218 | 
| 
| 
| 
| | 
| ND6F | ND1 ZND1 | ND5 ZND5 | ND5F ZND5F | | ZND5E | 1513 | | 
| 
| | | | | NDV1S ZNDV1S | NDV5 ZNDV5 | | | | 2056 | 
| | 
| | | 761mm 
| NA6 | | NA5 ZNA5 | | | NA15 | 292 | | | | | | 
| | | | | | | NG15F |
All dimensions are in mm Notes: These are outside elevations. Where windows can be handed, left hand elevations are shown. Window references in gold type indicate that the windows are available in Homelight double glaze construction. Use the suffix 'DG' after the type reference (e.g. ZNC2DG). Some of the illustrations are drawn in 'N' range proportions; some are drawn in 'Z' range proportions. The type reference printed immediately under the illustrations indicates which is shown. In most cases both 'N' and 'Z' sizes are available. Where the letter A appears within an illustration, it is recommended that an adjustable Trickle ventilator should be specified to provide secure, weather-tight trickle-ventilation at the head of the pane. Trickle ventilators can be fitted in any pane in a @n@ or 'Z' window 508mm or more in length. Note that safety glass may be required in certain panes depending on sill height (see BS6262) so 'FSB' windows could be more economical to install. Top hung fanlights in windows suffixed 'F' and 'V' are 306mm and 250mm high respectively. The minimum size of inner or outer frame for special manufacture of single glazed windows is 242mm. In the case of DG construction, minimum frame sized vary according to frame proportion. 285mm x 480mm and 400mx400mm are typical. Consult us for advice. It is recommended that a template is produced for curved and radius windows (for refurbishment).  
Crittall™ and Homelight™ are Registered Trademarks of Crittall Windows Ltd | 
