Hinge Height On Fire Doors

25 mm of the height of the door leaves. For a standard internal door its door lock is normally 42 from the floor to the centre of the latch. Depends on weight of door the norm 6 from top 9 from bottom middle in the middle of the two.

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The most common hinge height size is 4 1 2 then 5 followed by 3 1 2 4 and 6 then other sizes.

Hinge height on fire doors.

Door hardware measurements hinge height. 20 gage door constructions are approved for smaller door sizes than what is shown above. Once these dimensions are known the formula can then be applied. For doors over to 2 1 4 thick the hinge is set back 3 8 from the back face of the door.

Measure 5 inches from the top of the door. Fire ratings for doors are influenced by but not limited to the following items. The height of the hinge leaf. 6 4 3 1 6 the length of continuous hinges shall be within 1 in.

Lay the top hinge against the side of the door with the top edge on your mark. The upper hinge is 7 from top of door to top of hinge the bottom hinge is 9 from the floor. Two paragraphs were added in the 2013 edition of nfpa 80 to address continuous hinges used on fire doors. Steel gage of the door example.

For doors up to 2 1 4 thick the hinge is set back 1 4 from the back face of the door. Doors up to 60 inches in height shall be provided with 2 hinges and an additional hinge for each additional 30 inches of height or fraction thereof. 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. Hinge width does not impact frame hardware measurement.

These also appear in 80 2016. According to nfpa 80 if a fire door is more than 60 inches tall it requires at least 3 hinges. Just for fun i went back to the oldest edition of nfpa 80 that i have 1968 and it was a requirement then. Maximum doors size for fire ratings is influenced by but not limited to the following items.

The hinge leaf thickness. 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. On heavier doors the middle one might be 6 9 from top one also depends on the spec. 8 0 x 9 0 double door or pairs.

Wood metal door and hollow metal frame door is inset approximately 1 8. Make another mark on the door through the center screw hole of the hinge.

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