Patent attributes
A security unit protects a glazing unit supported by a window frame The window frame defines a void that is in communication with an air space through external air vents. The window frame has a side panel that defines side panel holes. The security unit includes a security panel that is spaced apart from the glazing unit to define an air cavity and is secured to a vertical tubular bar that is secured to a side panel of the window frame. The vertical tubular bar defines a passage therethrough in communication with the air cavity through air cavity vents and defines passage holes aligned the side panel holes. Air circulates from the air cavity to the air space through the air cavity vents, the passage holes, the side panel holes and external air vents.