According to their manual found here the gateway is.
Width 48.3 cm (19 inches)
Height 22.2 cm (8.75 inches)
Depth with projections 36.5 cm (13.7 inches)
Depth without projections 30 cm (11.8 inches)
Weight (fully loaded) 20.45 kg (45.1 lbs)
You may find more dimensions in this doc as well as it list a lot of configurations