Windows 101: Window Opening Control Devices (WOCD)

Window Opening Control Devices

Windows have many purposes in a home. Their aesthetics contribute to the overall design. But windows also have functional attributes, including air circulation and as a source of natural light. Most all windows are operational as well, meaning they are a means of escape. Building codes may require them to open fully. Because windows open, there must also be a way to safely secure them to prevent falls. That’s why many windows have a Window Opening Control Device (WOCD) option.

Factory-installed on windows, a WOCD acts as a fall preventative. WOCDs must meet ASTM F2090-10 standards. This specification establishes the installation, safety, performance and labeling requirements of a WOCD. Its intent is to address the risk of injury or death associated with accidental falls from windows, specifically concerning children five years old or younger. It applies to devices used on any window, including those designated as emergency escape or rescue.

A WOCD automatically limits the sash opening to less than four inches unless it is deliberately disengaged. The WOCDs used by JELD-WEN are designed them to meet the ASTM standard, while also not obstructing views.


  • Double- and single-hung WOCDs are available to match the hardware finish; see product specifications for exact finishes available.
  • The casement WOCD is not visible unless the window is open.
  • Streamlined design won’t obstruct views like many after-market options.
  • Automatically limits sash opening to less than four inches.
  • Manual override for full operation and for emergency escape and rescue.
  • Device automatically resets by closing the window.
  • Meets the ASTM F2090-10 standard.

WOCDs are available on:

  • Wood windows: casement and double-hung
  • Vinyl windows: casement, double- and single-hung and sliding