Common Elevations

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

Characteristics of Door Construction
"Standard door construction" varies by door manufacturer and door type

• 1 3/4" door thickness is standard for commercial use
• Beveled lock edges typical
• Square or beveled hinge edges available
• Inverted top and bottom channels
• Flush top and bottom channels integral with door construction or by addition of flush caps
• Visible hairline edge seams
• Seamless edges available

Grades & Levels of Steel Doors
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

Core Types

• Honeycomb
• Polystyrene
• Polyurethane
• Vertically Stiffened
• Mineral Fiberboard

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) doors are used for openings in four hour fire separation walls. These doors are typically supplied as flush.  If glazing is used, it must be a special 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) doors are typically used as a smoke barrier in places such as corridors.  Requirements vary depending upon gauge and type of door. 

Stainless Steel

• Provide corrosion protection and architectural design
• Variety of finishes available (standard is 304-4)
• Colored stainless steels available in satin and mirror finishes

Handing