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Common Elevations- Steelcraft Door Standards
F - Flush
G - Half glass (24" x 29")
FG - Full glass (24" x 60")
V - Vision lite (10" x 10")
BL - Bottom louver
NL - Narrow lite (6" x 36")
SNL - Special narrow lite (5" x 20")
MD - Dutch door
2G - Two lite door
Common Elevations - Mesker Doors Standards
Door Handing
Grades & Levels of Steel Doors
The following steel door grades and levels are defined by the Steel Door Institute (SDI)
Level 1 Standard Duty
20 gauge, 1 3/8" or 1 ¾" thick door
Model 1: Full flush Model 2: Seamless
Level 2 Heavy Duty
18 gauge, 1 ¾" thick door
Model 1: Full flush Model 2: Seamless
Level 3 Extra Heavy Duty
16 gauge, 1 ¾" thick door
Model 1: Full flush Model 2: Seamless Model 3: Stile & Rail
Level 4 Maximum Duty
14 gauge, 1 ¾" thick door
Model 1: Full flush Model 2: Seamless
Fire Rated Standards
- All components of a fire rated opening are considered part of the assembly, including the wall.
- The door must be self-closing.
- The door must be self-latching.
- Steel or stainless steel ball bearing hinges must be used.
- Louvers can be installed on fire rated doors dependent on the rating and local AHJ. If allowed, they have to be fusible link type.
- Lites are allowed, size is dependent on the rating.
A Label (3 hour rating)
These
doors are used for openings in four-hour fire separation walls and are typically supplied as flush. If glazing is used, it must be a specially approved glazing type, and it can only cover 100 square inches maximum.
B & D Label (1 1/2 hour rating)
Doors with B labels are usually used for stairwell and elevator doors but are sometimes used at all the rated walls in a building. Exterior walls where high fire exposure exists must use D label doors. When standard wire glass is used, a maximum of 100 square inches of exposed glass is allowed in B label doors (no glass on D label doors). The maximum allowed height or width of glass is 33". (Restriction on glass in doors requires 6" minimum rail on door.)
C & E Label (3/4 hour rating)
Doors with C labels are used for openings from a corridor into another room in the same building. Doors with E labels are used on exterior doors where moderate fire exposure exists. The maximum visible glass allowed is 1296 square inches when wire glass is used. The maximum allowed height or width of wire glass is 54". (Restriction on glass in doors requires 6" minimum rail on door.)
20 Minute (1/3 hour rating)
These
doors are typically used as a smoke barrier in places such as corridors. Requirements vary depending upon gauge and type of door.
