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There's a big variation between frame profiles and some are going to be better than others. I'd avoid the likes of the 88 Aluclip, as that's just a nice UPVC window with a trim stuck on. I'd be buying aluminium windows for the strength and rigidity of aluminium.
This lists a few profiles.
https://www.archiexpo.com/architecture-design-manufacturer/aluminum-window-profile-23777.htmlLike any window or door attention to detail when building the frames and fitting is probably more important than the actual profile!
user69121
Anyone had condensation issues on modern alu window frames? Need to decide soon and was interested in real life experience, apparently the thermal bridge is effective but I don't trust anyone in sales.