The PetSafe Extreme Weather Pet Door is not suitable for glass fitting Small For Pets up to 7 kg
 
Frame dimensions: 284 mm x 214 mm
Flap size: 205 mm x 130 mm
Cut out size for walls thinner than 54 mm: 258 mm x 165
Cut out size for walls thicker than 54 mm: 258 mm x 142 mm
Medium For Pets up to 18 kg
 
Frame Dimensions: 384 mm x 291 mm
Flap Size: 300 mm x 200 mm
Cut out size for walls thinner than 54 mm: 360 mm x 241 mm
Cut out size for walls thicker than 54 mm: 360 mm x 216 mm
Large For Pets up to 45 kg
Frame dimensions: 508 mm x 341 mm
Flap Size: 413 mm x 259 mm
Cut out size for walls thinner than 54 mm: 489 mm x 292 mm
Cut out size for walls thicker than 54 mm: 464 mm x 269 mm