MIDI HEKI HAS APERTURE OF 700 X 500. 

There is a pre 2020 version that just had a smoked glazing panel and a post 2020 version that has either a white or grey banding around the glazing panel. (only SOME parts are interchangeable, please check both versions diagrams and parts lists.

New white banded acrylic dome (bg4493-white) is compatible to fit on both old and new versions).