length   height
| PREFIX N - 997 PREFIX ZN - 1237 | 1486 | | 
| 
| 923 | NC13R ZNC13R | NC14R | 1067 | NC013R ZNCO13R | NCO14R | | 
| 
| 1218 | ND13R ZND13R | ND14RS | | 
| | 1513 | NDV13RS ZND13RS | |
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 | 
