A wall unit has NOTHING to do with windows. Ignore RKS. Reading the rest of this thread, you will se that RKS made a rubbish attempt at advising, was told to buck up on his reading/writing skills, I pointed out that he's not very good at the latter, to which he thought he'd make some snide remark about something I'd said in a completely different thread. As I said ingnore him. He is useless and obsessed, because I keep telling him that what he has been doing for the last 20 years is NOT THE ONLY WAY TO DO IT. He doesn't get 'irony' either. In a reply to one of his ungrammatical rants, I said, "I suppose you'll be telling me next that you can't install upvc windows to replace wooden ones in a Grade 2 listed building." I will explain the irony for his benefit. The sentence was a eupemism for, "Tell me something I DON'T know!" He's a roofer that's only ever heard of ONE type of rot(apart from the type he talks). Say no more. Mr. HandyAndy - Really
really special you are Handy andy!!!!! lots of different types of WET rots, but unfortunately clever mrHandyandy only one type of DRY rot, AGAIN talking of bad reading skills, read the post I put andy! again what's this got to do with this post, nothing! set of rules for me and a set of rules for others is it lol and if were talking like that! what did upvc windows have to do with the cast iron repair????, nothing and it was nothing to do with irony and you know it lol I do apologies for my computing skill! but is the easy option when someone takes a bit of stick to resort to it "ohh he cant read" or "he cant spell" once a points been proven wrong. Sticks and stone mate and your just deflecting the argument. Sorry for ruining the thread, I wont post any more on here what is not relevant, but talking of ruining the thread I've got a funny feeling andy will responed.
when fitting a wall unit you should use a wall bracket 2 brackets to one unit you make your measurements and mark your lines and then fix your wall brackets first then at the back of your unit should be already in each corner two ends that stick out lift your cabiniet on to your brackets this should hold it.Then from the front in each corner should be two screws one to pull it tight to the wall and one for fine height adjustment (level) the unit should now be tight against wall and solid.
on reading more of the threads i found out its not kitchen wall unit but for a bedroom although some other units are still fixed the same way yours might not but you could buy the brackets yourself from screwfix for a couple of quid product number 91611 and fit yourself that way it would be as good a fit as your kitchen wall units and should have no problems with weight as they are desighned to take weight.I think that would be the way to go and if you wanted you could still put a few screws through the back for peace of mind but only if the backing is thick enough which i think i read somwhere yours is but most units are only between 4mm-6 mm thick and would be useless