Specifications / Installation - Specifications: Hot Rolled


Casement or side-hung ventilators which swing outward, have hinges, locking handles, sill operators, or simplex hardware as required by project specifications. Ventilators may also be designed to open inward and have hinges, simplex hardware and a sill pull.

a. Hinges shall be extension or close type, friction or nonfriction type, made from steel, stainless steel, or bronze with non-ferrous pins or steel pins with non-ferrous bushings or washers. Two hinges are provided per ventilator, except for ventilators exceeding 5'6" in height, which are supplied with three hinges or two hinges and a midpoint closing mechanism.

b. A single locking handle, manufacturer's standard, shall be furnished for each ventilator except for ventilators exceeding 5'6" in height, which are supplied with two point locking devices or two individual locking handles.

c. When underscreen operators are specified, they shall be in accordance with manufacturer's standard, and non-friction type hinges shall be furnished.

d. Locking handles and underscreen operator housings shall be manufacturer's standard design. They shall be attached securely to the windows with brass or other corrosion-resisting screws.

e. Adjustable friction limit devices may be used instead of friction hinges to specify steel windows on your next project.


Projected-out ventilators shall have top rail sliding downward and the bottom rail swinging outward and upward. Projected-in ventilators shall have bottom rail sliding upward and the top rail swinging inward and downward.

a. Each ventilator is balanced on two heavy steel side arms attached securely to the ventilator and to the frame, and two non-ferrous friction shoes sliding in the channel of the jamb frame sections which shall hold the ventilator firmly in open positions. As an option, ventilators may be balanced on 4 bar steel hinge assemblies. Supporting arms and hinge assemblies shall be concealed when ventilator is closed.

b. Projected-in ventilators shall be provided with locking handles or spring catches. Projected-out ventilators shall be provided with locking handles or manufacturer's standard under-screen operator when specified. If the locking rail of ventilator is more than 6'6" above floor level, hardware designed for pole operation shall be furnished. Ventilators exceeding 4'8" in width are supplied with two locking handles.

c. Locking handles, spring catches, and underscreen operator attachments shall be manufacturer's standard design. They shall be attached securely to the windows with brass or other corrosion-resisting screws.


Double hung ventilators can be raised and lowered within a double channel frame, the bottom unit within the inner channel and the upper unit within the outward channel (upper unit to be lowered for maintenance purposes by the release of retaining angles located at the bottom of each upper ventilator). Positioning of ventilators in the frame controls the amount of ventilation. Closing requires both units to be fully extended and locked at the horizontal center rail. Single hung ventilator requires that the upper exterior unit be non-operable, and that the lower unit be operable.

a. Each ventilator shall have one sash balance attached securely to each jamb of the ventilator and to the frame which shall hold the ventilator firmly in an open position. Fusible links (if required) shall be fastened at the head of each balancer of the lower ventilator so that the ventilator may close automatically in case of fire.

b. Ventilators shall have a sweep lock at the horizontal center rail. Furnish two sweep locks for ventilator exceeding 3'2" in width.

c. Sweep locks and lift handles shall be the manufacturer's standard design and shall be attached securely to the windows with brass or other corrosion-resisting screws.


Awning windows provide simultaneous operation for large areas of outward opening ventilators. Ventilators linked in unison are activated and controlled by means of a detachable crank handle at the sill. For windows where sills are out of reach, remote controls can be provided for manual or electrical operation. Windows shall be made from heavy intermediate materials and construction as described under windows in the hot rolled sections.


Install windows into prepared openings, prepared by others, in strict accordance with approved shop drawings. Set units plumb, level and true to line, without warp or rack of frames or ventilators. Anchor units securely to surrounding construction with approved fasteners. The exterior joints between the windows, trim and mullions shall be properly sealed watertight with an approved sealant and neatly pointed. Attach ventilator hardware and adjust ventilators to operate smoothly, free from twist and be weathertight when closed prior to field glazing. Ventilators remain closed and locked during glazing. The field painting of windows must be performed prior to installation and shall include paint coverage to all surfaces of the frame and ventilator. On factory finished windows, repair any abraded area of the factory finish. Cleaning of masonry and other exterior or interior surfaces prior to installation is recommended. The General Contractor is responsible for protection of the windows and related materials during storage on the job and during and after installation, and for any protection required due to cleaning of adjacent materials. Window installer shall leave the surfaces clean and the General Contractor shall be responsible for final cleaning.


Glass contractors must make templates and check all measurements from the completed window and not from the window shop drawings. Windows can be prepared for either glazing compound or manufacturer's standard metal bead glazing. Factory glazing may be available, consult individual manufacturers. Steel window frames are designed to complement watertight glazing systems. The use of weep holes through glazed areas to drain accidental moisture is not recommended. Weep holes admit wind driven moisture to an otherwise dry glazed surface and create a source for air infiltration.


Manufacturing members of the SWI can supply a wide range of accessories for installation and operation of steel windows. They include: insect screens, associated components such as trim and mullions, mechanical operators, and anchor clips. In addition to manufacturers' standard designs, custom or modified designs can be supplied by individual manufacturers. Inquire with individual manufacturers for designs.

a. Anchor clips and mullions necessary for installation of windows and hardware for operation of the ventilators, including fasteners required for attaching such items to the window, shall be provided by the window manufacturer.

b. Screws, shields, plugs or other fastenings into the building construction and sealant material for metal to metal joints within the window opening are furnished by the window installer.

c. Furnishing and application of perimeter caulking between windows and building construction shall be the responsibility of the appropriate subcontractor as required under the caulking sections of the specification.

d. Insect screens - screen frame shall be of formed electro-galvanized steel having a minimum thickness of 0.032", or of formed or extruded aluminum having a minimum thickness of 0.040". Screens shall be rewirable with 18"x14" mesh cloth of bronze, 18"x16" mesh cloth of aluminum, or fiberglass. The nominal diameter of the cloth shall be not less than 0.0113" for bronze and 0.011" for aluminum. Wire cloth shall be held taut with removable spline. Screens with sliding or hinged wicket shall be furnished where required. Screens shall be the removable type, held in place by clips.

e. Mechanical operators - (Manual or Electrical Control). Mechanical operators provide for operation of the window ventilators that are inaccessible for normal hand operation, or for group control of several ventilators simultaneously from one central point. Common types of mechanical operators suitable for use with sidewall windows: the torsion lever arm type, rack and pinion type and screw type. Operators can be surface mounted or concealed in-wall systems. Consult individual manufacturers for details.

f. Mullions shall be standard tee bar, channel or plate type and not less than 12 gauge thick. Mullions shall be bolted or clipped securely to the window to form a rigid assembly. Mullion covers shall be included as standard. Note: mullions for cold-formed windows shall be not less than 20 gauge thick, channel or plate type.

Steel Window Types