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Climbing anchors will be way over-built, the weakpoint will almost certainly be what you are fixing into. Will you be screwing it into the wooden cabinet or do you have access to bolt through it? Will the slings then hang straight out of the window?
I would happily trust my life to 2 x 10mm lag bolts or similar if they were well tightened into solid wood and loaded in shear.
chiroshi-
Could either bolt through or screw into the solid battens behind it. I'm confident that a fixing like a coach bolt properly attached would mean that effectively the whole window frame/sill/under-sill cabinet would need to come loose in order for the ladder to fall (and that's bigger than the window!), but what I'm not sure about is what type of bracket/climbing anchor etcto fix to the wood with a coach bolt, if you catch my drift!
In climbing centres what do they use at the top of a top rope route? I'd assume something like that would be best.
Spxtz
I'm installing a fire escape ladder in my gable end bathroom. It's effectively a rope ladder that has two loops for carabiners and it will attach to the inside of a wooden cupboard that's been reinforced for the purpose of supporting it. I'm thinking to use climbing carabiners attached to slings that go through some kind of ground anchor fixing. But I don't know what to look for/what spec to aim for for that fixing. Does anyone have any tips?
From looking at the listings for escape ladders it appears that people use a mix of climbing anchors like Petzl Coeur bolts (if in concrete/stone) and random steel plate fixings (if in wood) but I wouldn't mind over-speccing this to be sure it's safe.