Getting the rough opening size right the first time will save you from frustration when installing your doors.
Fire door size chart.
Fire door standard sizes.
Steel gage of the door example.
2 1 2 4 louvers for fire doors.
When specified fire doors shall be provided with fire labeled louvers.
Common options are 2040 x 526 626 726 826 926 x 40mm.
The main difference between these and the standard uk sizes above are an increased door height of 2040mm and door thickness of 40mm.
Where required by a manufacturer s listing or ansi nfpa 80 fire doors and fire windows a steel overlapping astragal shall be provided.
20 gage door constructions are approved for smaller door sizes than what is shown above.
Door size conversion chart.
Maximum doors size for fire ratings is influenced by but not limited to the following items.
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.
Chart of door ratings and labels.
Just add 2 to the width of the actual door size.
You should add 2 1 2 to the height of the actual door.
Framing rough opening sizes are really quite simple.
This will give you room to space the door frame off of the sub floor.
Local codes should be reviewed but in general rated doors must be self closing and must have a positive latch.
Metric sized internal doors are becoming increasingly popular and are now commonly used in scotland and europe.
This is because extra core component materials are required in the construction of the door to achieve its fire rating.