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  • 1. General

    1.1   Scope of work

    The work required under this section shall consist of furnishing the 
    following items of custom hollow metal work as shown on architectural
    drawings and as specified herein:
    All hollow metal doors
    All hollow metal frames
    Special hollow metal (as indicated on plans)
    Stainless steel as required
    Hollow metal panels
    Pass through windows 
    Louver frames

    1.2   Work not included:

    The following work is specified elsewhere and is not included in this
    Hardware and its installation
    Glass and glazing 
    Structural steel forming, or reinforcement
    Field painting
    Protection at the building site of items furnished under this section
    Field assembly of spliced frames

    1.3   Shop drawings

    Six (6) copies of all necessary shop drawings shall be submitted to the
    Architect for his/her approval. These drawings shall fully describe and locate 
    all items being furnished. Approved shop drawings shall constitute final
    contract requirements, and no work shall be fabricated until the Architect has
    approved shop drawings for that work.

  • 2. Products

    2.1   Clearances

    Edge clearance:
    Between door and frame at the head and jamb- 1/8”. 
    At door sills with no threshold- 5/8” to 3/4” above finished floor or to 
    suit threshold. 
    Between meeting edges of door- 1/8”. 
    (Finished floor is defined as the top surface of the floor and should 
    correlate with the bottom of the frame.)

    2.2   Hollow Metal Doors

    A.    MATERIALS:
    Doors shall be made of commercial quality, level, cold rolled
    steel conforming to ASTM designation A-366 and free of
    scale, pitting or other surface defects. Face sheets for interior 
    shall not be less than 16 gauge. Face sheets for exterior doors 
    shall be not less than 16 gauge and shall be galvanized.

    B.    Design and Construction: 
    1.     All doors shall be custom made of the types and sizes shown on
    approved shop drawings and shall be fully welded seamless 
    construction with no visible seams or joints on their faces or 
    vertical edges. Minimum door thickness shall be 1- 3/4”.
    2.     All doors shall be strong, rigid, and neat in appearance, free of 
    warpage or buckle. Corner bends shall be true and straight and of 
    minimum radius for the edge of metal used.
    3.     Face sheets shall be stiffened by continuous vertical formed 
    steel hat section spanning the full thickness of the interior 
    space between door faces. These stiffeners shall be no less 
    than 22 gauge, spaced not more than 6” apart and securely 
    attached to the face sheets by spot welds not more than 4” 
    on center. Spaces between stiffeners shall be sound deadened 
    and insulated the full height of the door with an inorganic 
    noncombustible batt-type material. 
    4.     Door faces shall be joined at their vertical edges by a continuous
    weld extending the full height of the door. All such welds shall 
    be ground, filled, and dressed smooth to make them invisible
    and provide a smooth, flush surface.
    5.     Top and bottom edges of all doors shall be closed with a 
    continuous recessed steel channel not less than 16 gauge,
    extending the full width of the door and spot welded to both
    faces. Exterior doors shall have an additional flush closing
    channel at their top edges and, where required for attachment
    of weather-stripping, a flush closer of exterior doors to permit 
    the escape of entrapped moisture.
    6.     Edge profiles shall be provided on both vertical edges of doors
    as follows: 
    a. Single-acting swing doors – beveled 1/8” in 2”
    b. Double-acting swing doors – rounded on 2-1/8” radius
    7.     All hardware furnished by the hardware contractor for single-
    acting doors shall be designed for beveled edges as specified in 
    subparagraph 6 above.
    8.     Hardware reinforcements:
    a.    Doors shall be mortised, reinforced, drilled, and tapped at the factory
    for fully templated hardware only, in accord with the approved 
    hardware schedule and templates provided by the hardware 
    contractor. Where surface mounted hardware is to be applied, doors 
    shall have reinforced plate only; others shall do any drilling and 
    tapping, which includes through bolts.
    b.    Minimum gauges for hardware-reinforcing plates shall be as follows:
    Hinge and pivot reinforcement: 7 ga.
    Reinforcements for lock face, flush bolts, concealed holders, 
    concealed or surface mounted closers: 12 ga. 
    Hardware: 12 ga.
    9.     Glass mouldings and stops (if applicable):
    a.    Where specified or scheduled, doors shall be provided with hollow 
    metal mouldings to secure glazing by others in accordance with glass 
    opening sizes shown on approved shop drawings.
    b.    Fixed mouldings shall be securely welded to the door on the security side.
    c.    Loose stops shall not be less than 16-gauge steel. With butt corner 
    joints, secure the frame opening by cadmium or zinc-coated 
    countersunk screws.
    10.   (If applicable) Louvers shall be of the welded blade type of
    construction (providing the free air area specified by the
    Architect). Louvers pierced into the face sheets will not be
    Finish: After fabrication, all tool marks and surface imperfections shall
    be dressed, filled, and sanded as required to make all faces and vertical
    edges smooth, level, and free of all irregularities. Doors shall then be
    chemically treated to ensure maximum paint adhesion and shall be 
    coated, on all exposed surfaces, with a rust-inhibitive primer, which is
    fully cured before shipment.

    2.3   Panels

    Hollow metal panels shall be made of the same materials and constructed
    and finished in the same way specified for hollow metal doors.

    2.4   Gauges

    A.    Exterior doors 16 gauge
    B.    Interior doors 16 gauge

    2.5   Hollow metal frames

    1.     Frames for exterior openings shall be made of commercial grade cold-
    rolled steel conforming to ASTM Designation A366-68, not less than
    16 gauge, and shall have a zinc coating.
    2.     Frames for interior openings shall be either commercial grade cold 
    rolled steel conforming to ASTM A366-68 or commercial grade hot 
    rolled and picked steel conforming to ASTM A569-66T. Metal 
    thickness shall be not less than 16 gauge for frames in openings 4’0”
    or less than 16 gauge for frames in openings 4’0” or less width.

    1.    All frames shall be custom made welded units with integral trim, of 
    the sizes and shapes shown on approved shopped drawings. Knocked
    down frames will not be accepted.
    2.    All finished work shall be strong and ridged, neat in appearance, 
    square, true and free of defects, warps or buckle. Moulded members 
    shall be clean cut, straight and of uniform profile throughout their 
    3.    Jamb depths, trim, profile, and backbends shall be as scheduled by
    the Architect and shown on approved shop drawings.
    4.    Corner joints shall have all contact edges closed tight, with trim faces 
    mitered and continuously welded, and stops butted. The use of 
    gussets will not be permitted. 
    5.    Minimum depth of stops shall be 5/8”. Cutoff (sanitary or hospital 
    type) stops, where scheduled, shall be capped (at 45 degrees or 90 
    degrees) at heights shown on approved shop drawing.
    6.    When shipping limitations so dictate, frames for large openings shall 
    be fabricated in sections designed for splicing in the field by others.
    7.    Frames for multiple or special openings shall have mullion and /or 
    rail members which are closed tubular shapes having no visible seams
    or joints. All joints between faces of abutting members shall be 
    securely welded and finished smooth.
    8.    Hardware reinforcements:
    A.    Frames shall be mortised, reinforced, drilled and taped at the 
    factory for full templates mortised hardware only, in accord 
    with approved hardware schedule and templates provided by 
    the hardware contractor. 
    Where surface-mounted hardware is to be applied, frames shall 
    have reinforced plates only; and drilling and tapping shall be 
    done by others. 
    B.    Minimum thickness of hardware reinforcing plates shall be as follows:
    1.    Floor Anchors:
    Floor anchors shall be securely welded inside each jamb 
    with two holes provided at each jamb for floor anchorage.
    2.    Jamb Anchors:
    a.    Frames for installation in masonry walls shall be 
    provided with adjustable jamb anchors of the (t-strap 
    or stirrup-and-strap) type. Anchors shall be not less 
    than 2”x10” in size, corrugated and/or perforated. The
    number of anchors provided on each jamb shall be as follows:
    -Frames up to 7’6” – 3 anchors
    -Frames 7’6” to 8’0” – 4 anchors
    -Frames over 8’0” – 1 anchor for each 2’ or fraction thereof in height
    b.    Frames for installation in stud partition shall be provided 
    with steel anchors of suitable design, not less than 16 
    gauge thickness, securely welded inside each jamb as follows:
    -Frames up to 7’6” – 3 anchors
    -Frames 7’6” to 8’0” – 4 anchors
    -Frames over 8’0” – 5 anchor plus one additional for 
    each 2’ or fraction thereof over 8’0”
    c.    Frames to be anchored in previously placed concrete, 
    masonry or structural steel shall be provided with 
    anchors of suitable design as shown on approved shop 
    drawings. Others shall provide fasteners for such anchors.
    i.    Dust cover boxes (or mortar guards) of not thinner
    than 26-gauge steel shall be provided at all 
    hardware mortises.
    ii.   All frames shall be provided with a steel spreader 
    temporarily attached to the feet of both jambs to 
    serve as a brace during shipping and handling.
    iii.   (If applicable) Loose glazing stops shall be of 
    cold-rolled steel: not less than 18-gauge
    thickness, butted at corner joints and secured 
    to the frame with countersunk cadmium or zinc 
    plated screws. Loose stops at exterior frames 
    shall be placed on the exterior side of the frames.
    3.    Finish:
    After fabrication, all tools marks and surface imperfections
    shall be removed, and exposed faces of all welded 
    joints shall be dressed smooth. Frames shall then be chemically treated to 
    ensure maximum paint adhesion and shall be coated on all inhibitive primer, 
    which is fully cured before shipment. 
    4.    Labeled doors and frames:
    a.    Labeled doors and frames shall be provided for those 
    openings requiring fire protection ratings as determined 
    and scheduled by the Architect. Such doors and frames 
    shall be constructed as tested and approved by 
    Underwriters Laboratories or other nationally recognized 
    testing agency having a factory inspections service.
    b.    If any door or frame specified by the Architect to be fire 
    rated cannot qualify for appropriate labeling because of its
    design, hardware or any other reason, the Architect shall be
    so advised before fabricating work on that item is started.


    3.1   Site Storage and Protection of Materials
    A.    It shall be the responsibility of the general contractor to see that any 
    scratches or disfigurements caused by shipping or handling are promptly 
    cleaned and touched up with a rust inhibitive primer, and that materials 
    are properly stored on planks or dunnage, in a dry location, and covered to 
    protect them from damage.
    B.    Doors shall have their wrappings or coverings removed upon delivery at 
    the building site and shall be stored in a vertical position, spaced by a 
    blocking to permit air circulation between them.

    NOTE TO ARCHITECT: In that section of specifications where installation of the work 
    is specified, it should be required that:

    • Prior to installation, all frames must be checked and corrected for rack 
      twist and out of square. Frames must reset true and plumb and remain in 
      alignment until permanently built into the wall.
    • Proper door clearances must be maintained in accordance with part 2, section 
      2.2 of the specifications for custom hollow metal doors and frames, except for 
      special conditions otherwise noted. Where necessary, metal hinge shims are 
      acceptable to maintain clearances. Hardware must be applied in accordance 
      with hardware manufacturer templates and instructions.
Our custom frames are created to your specifications with the highest standards of workmanship to ensure serviceability and longevity.
West Central Manufacturing doors are of the highest quality construction and materials with no visible seams. They are constructed for extra heavy-duty applications.
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