Clearance for under the bottom of the door maximum is 3/4” Clearance between door and frame is 1/8” Clearance for meeting edges for a pair of doors is 1/8”
How much gap should be under a fire door?
Gaps between fire doors and the door frame should never be more than 4mm or less than 2mm. It’s recommended to aim for a 3mm gap to ensure adequate room for the intumescent strips to activate in the event of a fire, and for the smoke seal strips (if installed) to not get damaged by the opening and closing of the door.
Can fire rated doors be undercut?
1.15. 2 of the 2012 Life Safety Code says you must maintain the fire rated door assemblies in accordance with NFPA 80. Any clearance under the bottom of the door (while it is in the closed position) that exceeds ¾ inch will be considered non-compliant.
Should there be a gap under doors?
The gap at the bottom of an interior door should be 2 inches from an unfinished floor. Over a finished floor, the gap should be between ¾ to ½ of an inch, depending on the type of floor you have. The gap at the bottom of an exterior door should be almost nonexistent.
How do you seal the bottom of a fire door?
Intumescent seals may be placed into grooves machined in the two vertical sections and top edge of the door frame. When exposed to heat, intumescent seals expand to many times their original size, sealing the gap between the door and the frame and aiding containment of the fire.
What should you never do to a fire door?
Top things you should not do with fire doors
- Never lock a fire door. Emergency fire doors must not be locked, or fastened in a way that they cannot easily, and immediately, be opened by any person who may require to use them in an emergency.
- Never leave a fire door wedged open. …
- Never allow a fire door to be blocked. …
- Enfield Doors.
18.03.2019
Do smoke seals need fire test evidence?
The supplier of the smoke seal should provide test evidence in accordance with BS 476: Part 31: Section 31.1 to demonstrate that the seal has been incorporated in a test on a fire door assembly where the leaf has similar physical characteristics, e.g. thickness, weight, construction and stiffness as the leaf in the …
Does a fire door need a threshold?
BS 9999 recommends for fire doors with cold smoke control that the threshold gap should be either less than 3mm in height or should be fitted with a threshold seal. When speaking with manufacturers, however, a common statement is that a fire doors gap of up to 8 mm underneath the door is permissible.
What is door undercut?
UNDERCUT: The distance between the bottom of door and the bottom of the frame. FLOOR CLEARANCE: The distance between the bottom of the door and the top of the material directly below the door. This varies with applications, such as concrete, any floor covering and/or a threshold.
How are fire door clearances measured?
HOW TO USE THE CLEARANCE GAUGE:
- With the door closed, measure from the pull side of the door.
- Measure the clearance between the door and frame: Top. Hinge Side. Latch Side.
- Between the doors (when installed in pairs)
- Measure the clearance between the door and finished floor.
How do I increase the gap under my door?
If you have a large gap beneath the door, use a wrap-around door sweep. They have long adjustable sides that can be moved up and down along the width of the door. When the bottom of the sweep fills in the door gap, drill pilot holes through the sides and screw it down. Put in a door threshold.
What is the gap between door and floor called?
2 Answers. Door gap is the general name for all of the gaps around the door. FLOOR CLEARANCE: The distance between the bottom of the door and the top of the material directly below the door. This varies with applications, such as concrete, any floor covering and/or a threshold.
Why do doors have a gap at the bottom?
The gap is necessary to act as an air return when the doors are closed. Without the gap, little air will come out of the supply ductwork. It can impact the “balance” of your system.
Are fire doors air tight?
As a Fire door is required to form a virtual air tight seal when closed the failure to fit a fire door correctly will compromise the door’s performance and ultimately property and lives will be at risk. …
Do FD30 fire doors need intumescent strips?
The minimum rating of a fire door is now predominantly FD30, with intumescent seals being necessary to achieve this rating. This change came about in recognition that very tight edge gaps were necessary to achieve a FD20 fire rating when doors were subjected to fire resistance testing without intumescent strips.