Building Design and Construction Handbook - Merritt - Ventech!

WALL, FLOOR, AND CEILING SYSTEMS 11.119
TABLE 11.18 Typical Fire Ratings Required for Doors
Door use Rating, hr*
Doors in 3- or 4-hr fire barriers 3†
Doors in 2- or 11 ⁄2-hr fire barriers 11 ⁄2
Doors in 1-hr fire barriers
Doors in exterior walls:
3
⁄4
Subject to severe fire exposure from outside the building
3
⁄4
Subject to moderate or light fire exposure from outside the building
1
⁄3
Doors to stairs and exit passageways 11 ⁄2
Doors in 1-hr corridors
1
⁄3
Other corridor doors 0‡
Smokestop doors
1 ⁄3§
* Self-closing, swinging doors. Normally kept closed.
† A door should he installed on each side of the wall.
‡ Should be noncombustible or 1 3 ⁄4-in solid wood-core doors. Some codes do not require self-closing
for doors in hospitals, sanitariums, nursing homes, and similar occupancies.
§ May be metal, metal covered, or 1 3 ⁄4-in solid wood-core doors (1 3 ⁄8 in in buildings less than three
stories high), with 1296-in 2 or larger, clear, wire-glass panels in each door.
TABLE 11.19 Maximum Sizes of Openings in Fire Barriers
Protection of adjoining areas
Max area,
ft 2
Max
dimension, ft
Unsprinklered 120* 12†
Sprinklers on both sides 150* 15*
Building fully sprinklered Unlimited* Unlimited*
* But not more than 25% of the wall length or 54 ft 2 per door if the
fire barrier serves as a horizontal exit.
† But not more than 25% of the wall length.
SOURCE: Based on National Building Code, American Insurance Association,
New York.
Smokestop doors should be of the construction indicated in the footnote to Table
11.18.
They should close openings completely, with only the amount of clearance necessary
for proper operation.
[‘‘Standard for Fire Doors and Windows,’’ NFPA No.80; Life Safety Code, NFPA
No.101; ‘‘Fire Tests of Door Assemblies,’’ NFPA No.252, National Fire Protection
Association, 1 Batterymarch Park, Quincy, MA 02269.
‘‘Fire Tests of Door Assemblies,’’ Standard UL 10(b); ‘‘Fire Door Frames,’’
Standard UL 63; ‘‘Building Materials List’’ (annual, with bimonthly supplements),
Underwriters Laboratories, Inc., 333 Pfingsten Road, Northbrook, IL 60062.
‘‘Factory Mutual Approval Guide,’’ Factory Mutual Research, 1151 Boston-
Providence Turnpike, Norwood, MA 02062.
‘‘Hardware for Labeled Fire Doors,’’ Door and Hardware Institute, 14150 Newbrook
Dr., Suite 200, Chantilly, VA 20151.]