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Recommended Selection and Usage Guide
for Standard Steel Doors

SDI 108-10

Purpose

To establish guide criteria for the selection and usage of 1-3⁄4" and 1-3⁄8" standard steel doors.

Selection

Standard steel doors are classified in four levels:Level 1 – 1-3⁄4" and 1-3⁄8" standard duty, Level 2 – 1-3⁄4" heavy duty, Level 3 – 1-3⁄4" extra heavy duty and Level 4 – 1-3⁄4" maximum duty.

Each of the four levels noted above offer a range of construction models and designs to meet architectural
requirements for preference and appearance. The standard steel door construction models are full flush, seamless and, stile and rail.

Recommended minimum gauge requirements for the various levels and models of standard steel doors are indicated in table 1.

Usage

Selection of standard steel doors for general usage is made by analyzing criteria such as frequency of use, including subjection to and degree of possible abuse. Other criteria to be considered in door selection are: conformance to local building codes and fire code regulations; sound attenuation and/or insulation requirements; and architectural design and appearance.

Table 2 is a reference aid matching standard duty, heavy duty, extra heavy duty and maximum duty doors with general usage requirements within the classification of buildings. Where optional door levels and models are indicated, further analysis on an individual job basis is recommended.

When unusual or special door usage conditions are encountered, contact a representative member of the Steel Door Institute for consultation and guidance.

Table 1 – Standard steel door grades and models

Level
Model
Full Flush or Seamless
Construction
MSG No.
IP in
SI mm
1
Standard Duty
1
20
0.032
0.8
Full Flush
2
Seamless
2
Heavy Duty
1
18
0.042
1
Full Flush
2
Seamless
3
Extra Heavy Duty
1
16
0.053
1.3
Full Flush
2
Seamless
3
*Stile & Rail
4
Maximum Duty
1
14
0.067
1.6
Full Flush
2
Seamless

*Stiles and rails are 16 gauge; flush panels, when specified, are 18 gauge.

For complete standard steel door construction specifications and available sizes, refer to ANSI/SDI A250.8-2003 (R2008) (SDI-100), Recommended Specifications for Standard Steel Doors and Frames and ANSI/SDI A250.4- 2001 Test Procedure and Acceptance Criteria for Physical Endurance for Steel Doors, Frames, Frame Anchors and Hardware Reinforcings.

Table 2 - Suggested door levels and applications

Building Type

(Click the building type to expand)

Standard Steel Door Level
Level 1
Standard Duty
Level 2
Heavy Duty
Level 3
Extra Heavy Duty
Level 4
Maximum Duty
Door Design Nomenclature

Apartment
Main Entrance  
Level 2
Level 3
 
Unit Entrance
Level 1
Level 2
Level 3
 
Bedroom
Level 1
     
Bathroom
Level 1
     
Closet
Level 1
     
Stairwell  
Level 2
Level 3
 
Dormitory
Main Entrance  
Level 2
Level 3
Level 4
Unit Entrance
Level 1
Level 2
   
Bedroom
Level 1
Level 2
   
Bathroom
Level 1
Level 2
   
Closet
Level 1
Level 2
   
Stairwell  
Level 2
Level 3
 
Hotel - Motel
Unit Entrance
Level 1
Level 2
   
Bathroom
Level 1
     
Closet
Level 1
     
Stairwell  
Level 2
Level 3
 
Storage & Utility  
Level 2
Level 3
 
Hospital Nursing Home
Main Entrance    
Level 3
 
Patient Room  
Level 2
   
Stairwell  
Level 2
Level 3
 
Operating & Exam.  
Level 2
Level 3
 
Bathroom  
Level 2
Level 3
 
Closet
Level 1
Level 2
   
Recreation  
Level 2
   
Kitchen  
Level 2
Level 3
 
Industrial
Entrance & Exit    
Level 3
Level 4
Office
Level 1
Level 2
   
Production    
Level 3
 
Toilet
Level 1
Level 2
   
Tool    
Level 3
Level 4
Trucking    
Level 3
Level 4
Monorail    
Level 3
Level 4
Office
Entrance    
Level 3
 
Individual Office
Level 1
     
Closet
Level 1
     
Toilet  
Level 2
Level 3
 
Stairwell  
Level 2
Level 3
 
Equipment  
Level 2
Level 3
 
Boiler  
Level 2
Level 3
 
School
Entrance & Exit    
Level 3
Level 4
Classroom  
Level 2
   
Toilet  
Level 2
Level 3
 
Gymnasium    
Level 3
Level 4
Cafeteria  
Level 2
Level 3
 
Stairwell  
Level 2
Level 3
 
Closet
Level 1
Level 2
Level 3
Level 4

Note: Table 2 is only a guide. Please consult ANSI A250.8 (SDI-100) and applicable building codes for additional requirements.

TOP

Steel Door Institute Standard Steel Door Design Nomenclature

Click the numbers to view the various door design nomenclature


Nomenclature Letter Symbols
F
T

WG
E2
E4
E6
E8
- Flush
- Textured
- Wood Grain
- 2 Panel Embossed
- 4 Panel Embossed
- 6 Panel Embossed
- 8 Panel Embossed
EWG
D
L
LL
V
VL
N
- 6 Panel Embossed with Wood Grain
- Dutch Door
- Louvered (top or bottom)
- Louvered (top and bottom)
- Vision Light
- Vision Light and Louvered
- Narrow Light
NL
G

EG
GL
FG
F
- Narrow Light and Louvered
- Half Glass (options G2, G3,
G4 and G6)
- Embossed and Half Glass
- Half Glass and Louvered
- Full Glass (option FG3)
- Full Louver

*Note: Design combination is indicated by light followed by louver.

Louvered door designs are further specified as inserted louver (I), pierced (P), or air condition grille (A). When ordering, specify design, louver size and/or free area requirements.