Metric sized internal doors are becoming increasingly popular and are now commonly used in scotland and europe.
Fire door size chart.
This will give you room to space the door frame off of the sub floor.
Door size conversion chart.
Local codes should be reviewed but in general rated doors must be self closing and must have a positive latch.
There are also limits to the size of glazing in the door the width of gaps between door panels the height of the door under cut and the size of air transfer grilles.
Common options are 2040 x 526 626 726 826 926 x 40mm.
Fire door standard sizes.
You should add 2 1 2 to the height of the actual door.
The main difference between these and the standard uk sizes above are an increased door height of 2040mm and door thickness of 40mm.
20 gage door constructions are approved for smaller door sizes than what is shown above.
Just add 2 to the width of the actual door size.
Getting the rough opening size right the first time will save you from frustration when installing your doors.
Chart of door ratings and labels.
This is because extra core component materials are required in the construction of the door to achieve its fire rating.
Steel gage of the door example.
Metric size fire doors are also available within some of the ranges and there is usually the option of the following sizes to select from 626mm x 2040mm 726mm x 2040mm 626mm x 2040mm and 926mm x 2040mm it is worth noting that although these are standard metric sizes not all doors will be available in these sizes whilst metric size doors.
Framing rough opening sizes are really quite simple.