Single/double hung windows consist of two separate window panels, both of which slide up and down. Typically, the window is opened by sliding the bottom panel upwards.

• If the depth of the frame is less than ¾ inch, the guard will need to be mounted on the outside of the window frame (on the molding or wall around the window). The end posts are ¾ inch wide and need at least that much space for installation. Please keep in mind, the end posts need to be screwed into solid material or stud for proper operation.

• This will determine the width of the guard.
  

• The height of the 4 bar guard is 21 3/8 inches. The window should not exceed this height. If the window's opening is more than 21 3/8 inches high, you can use a window stop to prevent the window from opening above the guard or choose a 5 bar guard.   If the top window panel opens, and it can't be secured, the entire window must be guarded. You will need a vertical style guard (see instructions on how to measure sliding windows).

Cautionary Note
There should be no more than a 4-inch opening anywhere in the guarded area. This includes the area between the top bar on the window guard and the bottom of the opened window panel. (Figure 1-2)