Hinge Height On Fire Doors

These also appear in 80 2016.

Hinge height on fire doors.

The upper hinge is 7 from top of door to top of hinge the bottom hinge is 9 from the floor. Door hardware measurements hinge height. 8 0 x 9 0 double door or pairs. Just for fun i went back to the oldest edition of nfpa 80 that i have 1968 and it was a requirement then.

Steel gage of the door example. According to nfpa 80 if a fire door is more than 60 inches tall it requires at least 3 hinges. The most common hinge height size is 4 1 2 then 5 followed by 3 1 2 4 and 6 then other sizes. From under head cl 9 3 4 top of door 9 5 8 from bottom of frame cl 10 3 8 bottom of door 9 5 8 due to the the fractional calculations the bottom hinge cl may vary plus or minus 1 64 center two hinges are equally spaced between top and bottom.

Fire ratings for doors are influenced by but not limited to the following items. Two paragraphs were added in the 2013 edition of nfpa 80 to address continuous hinges used on fire doors. On heavier doors the middle one might be 6 9 from top one also depends on the spec. 25 mm of the height of the door leaves.

Wood metal door and hollow metal frame door is inset approximately 1 8. 20 gage door constructions are approved for smaller door sizes than what is shown above. Make another mark on the door through the center screw hole of the hinge. For a standard internal door its door lock is normally 42 from the floor to the centre of the latch.

Once these dimensions are known the formula can then be applied. Lay the top hinge against the side of the door with the top edge on your mark. Modern flatted properties are usually fitted with external fireproof doors as standard and most of these are flush fire doors this is due to our greater understanding of the importance of preventing and containing a blaze to allow the maximum time possible to vacate a burning building. Maximum doors size for fire ratings is influenced by but not limited to the following items.

The height of the hinge leaf. Depends on weight of door the norm 6 from top 9 from bottom middle in the middle of the two. Hinge width does not impact frame hardware measurement. For doors over to 2 1 4 thick the hinge is set back 3 8 from the back face of the door.

The hinge leaf thickness. For doors up to 2 1 4 thick the hinge is set back 1 4 from the back face of the door.