Recommended Details for
Standard Steel Doors,
and Related Components
The information that follows represents the Standard Steel Door and Frame
Industry's considered views on a number of details normally encountered in
building plans and specifications.
The Steel Door Institute recommends that they be followed except when very
unusual details necessitate special drawings. The enclosed may be used as a
reference document or added directly to the job drawings.
Definition of “STANDARD”
We call our products Standard for three reasons:
FIRST, because our products are made to conform to published standards and
SECOND, our products are manufactured to meet established performance
THIRD, the fabrication of our products is controlled by standard manufacturing
procedures which ensure uniform high quality.
Standard Steel Door
Note: Center Hinge Omitted on 6' 8" (2032mm), 1 3/8" (34.5mm) Doors, Unless Specified
Standard Frame Details
Special Frame Construction Details and Typical Hardware Preparations
Standard Details for Dutch Doors
Standard Steel Doors
Standard steel doors can be provided with a variety of louver designs and
sizes. This publication contains explanations and details of louver designs
that are most commonly available within the standard door industry.
When specified, doors shall be provided with louvers at the bottom and/or top.
The choice of which to use must be determined by the architect on aesthetic,
functional, and economic grounds.
Function – Louvers permit free air passage, controlling
the volume by their size or design. They diffuse or control
direction of air flow by blade design.
Insert louvers – Louvers commonly used in standard steel
doors are of the “insert” type designed to be mounted into
a cutout in the door and an overlapping frame. Inverted
“V” blade, “Z” blade, inverted “Y” or chevron-type blade,
lightproof, adjustable blade, grille type, and fusible link
self-closing fire door types are available in a wide range of
sizes. Also available from some steel door manufacturers is
a pierced louver design. Insert louvers intended for exterior
doors or other doors where security is a consideration
should have fasteners or materials specified accordingly.
Note: If a louver door is required to provide security, the
steel door manufacturer should be consulted.
Bird or insect screens are available with many of the standard
design louvers. Where specified, consult steel door
manufacturer for availability.
Weatherproof louvers – True weatherproof designs do
not exist. Some louvers are manufactured to provide a
certain degree of rain protection.
Louver construction – Standard louver frames are a minimum
20 gauge steel with louver blades of a minimum 24
gauge steel. The louver blades can be welded or tenoned
to the frame and the entire assembly is generally fastened
to the door with moldings. Generally, one molding will be
an integral part of the louver, while the other molding will
be detachable. When louvers are installed, the detachable
moldings should be located on the room or non-security
side of the door. Where doors are manufactured as nonhanded,
louvers may require reversing during door installation
to suit actual handing.
Inverted “V” or “Z” blade types allow maximum free air
flow with minimum static pressure differential.
Inverted “Y” or chevron blade types, while offering less
free air flow, offer a higher strength factor for schools and
other areas where vandalism or hard usage may occur.
Lightproof louvers are used where light transmission must
be avoided, but provide minimal free air flow.
Adjustable blade louvers are used where air flow is varied
in velocity and control of flow is needed.
Grille type louvers are normally associated with air conditioning,
where air must be diffused in random flow, avoiding
higher velocity air flow patterns.
Fusible link louvers are used in fire doors where flames
and intense heat passage must be controlled. The link
release temperature recommended is 135°F (57°C). These
louvers must be labeled and may not exceed 24˝ x 24˝.
Fusible link louvers are allowed only at the bottom of fire
doors. Since closing is heat activated, these louvers are
not to be used on smoke control doors.
Pierced louvers, available from some steel door manufacturers,
offer a flush condition and may be furnished with
internal insect screens. Louvers are formed by embossing
the door face sheets.
Louver size determinations – As a guide, the following
approximate percentages of louver size may be used to
determine the free area in a given size louver:
- Pierced louver 20%
- Inverted “V” inserted louver 50 – 60%
- Inverted “Y” (chevron) inserted louver 40 – 60%
- “Z” type inserted louver 40 – 45%
- Adjustable inserted louver 40 – 50%
- Lightproof inserted louver 20%
- Fusible link inserted louver 45%
The above percentages assume there is no air pressure
drop from one side of the door to the other. On air condition
grilles an air pressure drop is normal. An average 70% of
the grille size can be used in computing free area on doors
with air condition grilles.
The percentages noted above are approximates. Consult
the individual manufacturer’s literature for the specific sizes
and ratings normal to their program.
Coordination – A combination of glass lites and louvers is
common in steel door work. Care should be taken to avoid
specifying too long a narrow lite when a louver or grille occurs
in the bottom of the same unit. In addition, handicap
codes may dictate the location of the louver relative to the
bottom of the door.
Full louver doors – A minimum 5˝ (127.0mm) rail occurs
at the top and at the vertical stiles and an 8˝ (203.2mm)
minimum rail occurs at the bottom of these doors (Consult
door manufacturer for exact stile/rail dimensions). Stile and
top rail sizes must be coordinated with closer dimensions,
lock preparations, and lever handles. Pierced louvers are
not available on full louvered doors.
Finish – The finish is to be prime painted, except when the
louver is used in a factory prefinished door, in which case
the louver will be finish painted with a color to match the
door. For exterior doors, zinc coated louvers are available
Cross Section Details
Door, Frame and
Doors and Frames
The purpose of this publication is to establish a guide for architects and those responsible for scheduling doors,
frames, and hardware requirements.
Although primarily designed for steel doors and frames, this suggested schedule is flexible enough to list total
door and frame requirements of a complete job.
Items not specifically covered in the schedule may be listed in the “Remarks” and extra columns near the end.
Typical handing of doors and hardware is to be based on the format below:
Door, Frame and Hardware Schedule
(1) If a fire door is required, it is to be designated in the “Label” column of schedule with appropriate hourly rating. Also, note in the “Remarks” column whether
door is to have an Underwriters’ Laboratories (UL) Factory Mutual (FM), or Warnock Hersey (WHI) label.
(2) Thresholds, when required, are to be noted in “Hardware” column of schedule.
(3) Any special item not listed in schedule for doors, frames, or hardware is to be shown in the “Remarks” column.
(4) Indicate gauge of material for steel. When materials other than steel are used, indicate AL for aluminum or WD for wood.
(5) Refer to SDI-106 for Recommended Standard Door Design Nomenclature.
(6) When frame elevations are indicated, supplemental drawings must be attached.
(7) Doors provided with 3/4" undercut unless otherwise specified.
Guidelines for the Use of
Gasketing and Thresholds
for Standard Steel
Doors and Frames
The following details represent the recommendation of The Steel Door Institute in this important corollary
area. This document should in no way be considered an endorsement of any manufacturer nor does it imply
that any materials not shown should be considered inferior weatherstripping.
The criteria employed in the selection of these details included:
- The experience of the Institute with the details shown.
- The adaptability of the material shown to standard steel doors and frames.
- The ability to maintain gasketing at the door and frame during periods of
normal thermal movement to the balance of the building structure.
- The availability of the material from normal commercial sources.
- Ease of maintenance.
Since the members of the STEEL DOOR INSTITUTE do not manufacture gasketing, it is strongly suggest
that the BHMA Members’ catalogs and BHMA documents be consulted to establish “fit and function” criteria
for specifying of any gasketing. BHMA Documents are available from:
Builders Hardware Manufacturers Association
355 Lexington Avenue, 15th Floor
New York, NY 10017
Phone: (212) 297-2122
Fax: (212) 370-9047
Gasketing and thresholds are used to control the flow of air, smoke, heat or cold, water, sound or other environmental
factors through the door opening. The location or intended use of the door assembly, the environment to
which it is exposed, and the performance expected will dictate the selection of gasketing and threshold products.
The variety of materials, their composition, profiles, and performance are virtually limitless. These are described
in ANSI/BHMA A156.21 or A156.22. Generally, gasket materials are sponge neoprene, rubber, vinyl, brushes, or
magnets. Retainers are generally steel, aluminum, brass, bronze, vinyl, or other non-ferrous materials. Information
in catalogs published by BHMA members aid in the selection of perimeter sealing “ systems” to meet the
applicable performance criteria of the door assembly.
Sealing of gaps between door edges and the header or jambs generally has the greatest effect on performance
of the door opening. The available options are as varied as their applications and their mounting surfaces e.g.
steel, structural steel, or wood. Care should be taken to select materials that will assure performance under
specific job requirements as well as meeting the mounting surface criteria.
Gasketing products should never impede the operation,
opening or closing of the door assembly. Simple
contact is all that is required for some products. Other
products for more severe installations require a slight
compression. A simple test for gasket compression
may be conducted by inserting a sheet of letterhead
paper into the gap and closing the door. The paper
should be held in place by the gasketing.
Gasketing or weather-stripping, of any kind, should be
furnished and installed in accordance withmanufacturers
Door Bottom Seals
In most instances, sealing of gaps between the bottom of doors and flooring or thresholds is accomplished with
door bottoms or overlapping strips in metal retainers. These may be of a design that extends beyond the bottom
of the door mechanically, or of a fixed protruding or overlapping design.
Door bottom gaskets must compress against a solid object to affect a proper seal. Carpeting by its pliant nature
does not provide a proper seal.
Sealing of door edges at meeting stiles, in lieu of or in addition to factory mounted astragals is accomplished
by supplemental gasketing. This gasketing may be closely abutting fixed members or by overlapping strips in
Overlapping gasketing is normally used to avoid interference with edge mounted hardware such as locksets
or flush bolts. Closely abutting gasketing is commonly used where both doors must operate simultaneously or
independently as in egress doors.
Thresholds may be used in addition to or in lieu of door bottom seals. They may incorporate gaskets or other
formed profiles to allow for exit device latching or may be prepared for flush bolt latching. Thresholds should be
provided under the door and between the frame to allow for a smooth transition between floor coverings of different
heights or materials. Special consideration should be given to threshold designs used in means of egress
or in handicap accessible situations. The latter limitations are covered in ANSI/ICC A117.1.
Fire Door Considerations
When supplying products to be used on fire rated openings, care should be taken to maintain the proper
clearances around the perimeter of the door assembly in accordance with NFPA 80. Gasketing materials
must be investigated or “Listed” to determine that their installation does not adversely affect the fire resistance
performance of the assembly. For example, the performance of gasketing is observed during the fire
test to ensure that flaming does not occur on the exposed surface of door assemblies. It is important to
note, however, that the ANSI/UL 10B, ANSI/UL 10C and ANSI/NFPA 252 standard fire tests do not include
evaluation of the door assembly relative to preventing the passing of smoke or other products of combustion
through or around the assembly. Openings that require a smoke seal must be tested in accordance
with NFPA 105, UL 1784 or UBC 7-2 Part 11, 1997. In fire door applications it is VITAL that gasketing does
not inhibit the ability of the door assembly to close and latch.
Performance Testing Criteria
Gasketing products are covered under ANSI/BHMA A156.22.
Included in that standard are:
- Closing Force test
- Heat Test
- Cold Test
- Air Infiltration Test
Thresholds are covered under ANSI/BHMA A156.21.
Included in that standard are:
Existing Wall Anchors
Standard Steel Doors
This standard is a guide for architects to help them
recognize available options to the traditional sub
buck detail widely used in the past. The anchoring
systems shown are available in regular and labeled
The details shown are typical of those employed
by members of the Steel Door Institute, but all of
the details are not made by all of the members of
the Institute. A general reference to this document
in your specifications should result in all of the
members of the SDI and most of the non-members
being able to bid on the job without a multitude of
In order to make the installation successful, careful
consideration shall be given to all tolerances
involved and that sufficient clearance is figured to
allow for them.
It has been “customary” to allow 1⁄4˝ clearance
around the frame perimeter when establishing
rough opening sizes or when figuring non-standard
overall frame sizes. Although this dimensional requirement
does not appear in Industry publications,
it is based on the following:
- Both SDI 117-00 and ANSI/NAAMM HMMA
861-00 recognize a + tolerance in opening
width and height.
- Both of these documents recognize a ± tolerance
in frame face dimensions.
- Both ANSI/NAAMM HMMA 861-00 and SDI 117-00 recognize a ± installation tolerance
for vertical plumb.
Frames will “fit and function” if made to these dimensional tolerances and installed within tolerances.
There is, however, relatively no assurance that the
substrate (walls) will be of suitable size or alignment.
We therefore recommend that the rough openings
for these cases be no less than 3/16˝ larger on all 3
sides than the “intended” overall frame size. (Example:
3070 standard frame = 3´-4 3⁄8˝ x 7´-2 3/16˝). The
installer carries the responsibility for shimming and
aligning as necessary. Gaps are normally sealed as
part of the installation or caulking/painting process.
Architectural Specifications are to be consulted to
determine the appropriate sealant material to be
used at fire door or smoke control frames.
Standard Preparation for
Double Type (Interconnected) Locks on
Standard Steel Doors and Frames
Note: Minimum size of cutout as noted is subject to manufacturer’s standard clearance tolerances.
High Frequency Hinge Preparations for Frames
There are occasions where steel frames used in extremely high frequency or high use areas need to be supplied with
additional reinforcing to eliminate potential door sag. These types of openings would include: main entrances to schools,
rear exits where severe wind abuse could be a factor, auditoriums, gymnasiums, and the like. When these types of installations
are required, there is a method in which this can be handled, efficiently and economically, through providing
auxiliary reinforcing to standard door frames. The specification for this is as follows:
When a high frequency preparation is required, the top hinge of the door frame shall be provided with an auxiliary reinforcement
as shown in example ‘A’ or ‘B.’ For additional strength, the center and bottom hinge reinforcement may also be
provided with additional reinforcements.
* High frequency hinge preparations may vary between manufacturers.