Metal strips around framing of a window opening?

[stuartb3502]

We've had some bifolds fitted. Plasterer is trying to make good and needing to find space due to a trickle vent which is too high (too close to current reveal).

It's a timber-framed house and around the opening are small metal strips fixed on one end to the frame but seemingly not attached or doing anything at the other end. These were then covered with a piece of ply with cut outs around each of the metal strips. Plasterboard was fixed onto that. The photo I've attached is looking up at the top of the opening. The ply has been removed here showing the metal strips under that green membrane. You can see the trickle vent hole in the frame on the right.

Curious as to what they're for and whether it's OK to remove that ply and plasterboard/plaster here instead.

This is all happening because the window fitter has installed a trickle vent too high and it's not possible to make good without creating some space and using thinner plasterboard. I'm still trying to get old of the fitter (this is their subbie plasterer), but don't want to accept a solution if it's in fact a bodge which will cause issues later.

 

[Deleted member 323070]

I can't see clearly. but they look like the normal fixing brackets for windows.

Window Installation Fitting & Fixing Straps, Brackets Lugs & Clips

Window Installation Fitting & Fixing Straps Brackets Lugs & Clips for easy Window Frame Fixing. Frame Fix make Bespoke Window Hardware & Window Fixings

www.framefix.co.uk

 

[stuartb3502]

Thanks. They do look a bit like those you linked, but they don't swivel as it says those do. Most likely they were for the old windows however as it looks like they've been cut off at the ends by the fitter.