Two powder coated aluminium framed
insect screens
are used to screen this type of application when the opening handle is situated
at the top of the window.
One fly screen is secured to the top half of the window externally while the other
is secured to the bottom half internally; the window opens normally between the
two fly screens.
When a handle is situated at the bottom, it must be replaced with a chain winder
to adopt the above configuration.