length   height
| PREFIX N - 997 PREFIX ZN - 1237 | mm | 
| | | 
| 
| | | | 292 | NG2 ZNG2 | | | NG13 ZNG13 | NG13G ZNG13G | | | | 457 | NH2 ZNH2 | | | NH13 ZNH13 | NH13H ZNH13H | | | | | 
| 
| | 
| 
| | | | 628 | NE2 ZNE2 | NES2 ZNES2 | | NE13 ZNE13 | NE13E ZNE13E | | | | | 
| 
| 
| 
| 
| 
| 
| 
| 923 | NC2 ZNC2 | NC2F ZNC2F | NC7 ZNC7 | NC13 ZNC13 | NC13C ZNC13C | NC13F ZNC13F | NC13H ZNC13H | ZNC2V | 1067 | NC02 ZNC02 | NC02F ZNC02F | NC07 ZNC07 | NCO13 ZNCO13 | NCO13CO ZNCO13O | NCO13F ZNCO13F | | ZNC02V | | 
| 
| 
| 
| | 
| 
| 
| 1218 | ND2 ZND2 | ND2F ZND2F | ND7 ZND7 | ND13 ZND13 | | ND13F ZND13F | ND13E ZND13E | ZND2V | | | 
| | 
| | 
| | 
| 1513 | | *NDV2FSB *ZNDV2FSB | | NDV13 ZNDV13 | | NDV13F ZNDV13F | | ZNDV2V | | 
| 
| 
| 1143mm 
| | | | | 2056 | NA13F | NA2 | NA25 | ZNA25 | | | | | | | | 
| | | | | | | 292 | | | NG25F | | | | | |
All dimensions are in mm Notes: These are outside elevations. Where windows can be handed, left hand elevations are show. 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 | 
