This device measures 280mm
left to right and 230mm top to bottom as shown. The flange is 108mm
square.
The output flange, above, measures
108mm square. The aperture is 60x28mm. The connector shown above connects
to the two tubes running above and below the central glass section as
shown in the left hand picture. The tubes have holes in the rear so this
is probably to air cool the output window.
Below is a picture of the reverse
side of the device, and the top view.