Child Safety Window Guards from Guardian Angel, 4 Pack, 1417-44 E conomical package of four 4 GA1417-44 Guardian Angel Window Guards for Horizontal or Vertical Installation in Windows. Made in USA. Made from strong, steel tubing powder coated with a durable, lead-free white paint. Each protects maximum opening of 21.5 inches. Each expands from 14 to 17 inches. Window screens are not strong enough to keep children safe from window falls. Guardian Angel escape or egress guards remove using 4 emergency release buttons, 2 on each side of the bars. Tested to withstand up to 150 lbs of force in locked position. Remove window guards from inside or outside the window. Bar spacing of 3 7/8 exceeds 4 to 5 safety standards. Side posts anchor with 2 sheet metal screws into solid stud or frame mats.Conforms to American Society for Testing and Material standards ASTM F2090-01A and recognized by the U.S. Consumer Products and Safety Commission.Conforms to most local fire and building codes for egress type window guards. Meets Massachusetts building codes 780CMR 3603.14.2.2 and 780 CMR 1010.4. Made in USA. Lifetime guarantee by manufacturer. How to measure for child safety window guards Identify window type. VERTICAL The window opens by sliding a panel to the side in a track, cranking a panel out or pulling or pushing a panel of glass in or out. Guards for vertical windows are mounted like prison bars to protect either the entire window opening or the entire window. SINGLE HUNG The lower window panel moves up and down in a track. DOUBLE HUNG Both the upper and the lower window panels move up and down, each in its own track. For Single or Double hung windows, customers usually protect only the window opening. This is done with a single guard with a window stop to keep the window from opening above the top of the mounting bar. To protect both panes, vertical guards can be mounted side by side or stacked like a ladder. Decide where to mount window gua This item ships from a separate warehouse and may require extra time for delivery.