High coverage - requires a bit of manual dexterity

The product comes from the House LUX and is therefore an OBI private label. I have built in a day 4 pieces of it at our house.
The installation is described not that great in the manual, can be with a little logic but derived.
For me the enclosed screws (M4) were too short to reach through the light shaft grating. Can possibly be because our grids are already 40 years old. This is easy to fix with M4 threaded sleeves and short screws, but is not cheap. A threaded sleeve costs in construction market as about 0.80. After closer examination (24 threaded sleeves for my 4 Gitterbenötigt would) I have decided to grind M6 machine screws at the top so that they fit into the groove of the frame profile. That was a very good and inexpensive solution if you have the appropriate tool. (Dremel grinder and small vise to clamp) It is also quite fast.
For the shortening of the frame profiles (aluminum) requires a good hacksaw or an angle grinder with metal separator sheet.
I recommend as opposed to manual collect the brush strip prior to mating, which is much easier than you hineinzufummeln retrospectively. For me one minute effort prior to mating, nearly 20 minutes if you do it later.
The corner covers cover small inaccuracies when sawing off great.
The result has become great in any case. For technically equipped users a clear recommendation.