HOME ABOUT US MEMBER COMPANIES THE MANY REASONS TO USE STEEL WINDOWS AND DOORS SPECIFICATIONS / INSTALLATION PRODUCTS REPLACEMENT VS. RESTORATION RECYCLABILITY STATEMENT FAQ's CONTACT US     GENERAL SPECIFICATIONS ARCHITECT'S GUIDE TO STEEL WINDOWS SPECIFICATIONS: COLD ROLLED SPECIFICATIONS: HOT ROLLED GUIDELINES ON HOW TO INSTALL STEEL WINDOWS   DOUBLE AND SINGLE HUNG WINDOWS 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. © The Steel Window Institute (2006) Contents are the property of the Steel Window Institute, its members or others who have licensed the information. All rights reserved.   GENERAL SPECIFICATIONS LINKS CASEMENT WINDOWS PROJECTED WINDOWS DOUBLE & SINGLE HUNG WINDOWS AWNING WINDOWS INSTALLATION GLASS & GLAZING ACCESSORIES WINDOW TYPE ILLUSTRATIONS