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Thanks, it's the same U shape and has two retaining screws either side. I've got those off and released it no problem. The issue is that it's in a recess with a lip, and I just can't get it out of there to remove completely and get enough access.
It sits on a flat metal plate that also appears to support the motor. It's held in with 9 screws around the perimeter - I think I'm going to drop that to get the room needed to remove it. What an overcomplicated design.
Familyman-
Normally they have an extendable part between ceiling and hood. Looks like in your case it just fit the space exactly and they left out the extension and fit it all with the hood going in last. Probably thought they had done really well to get away with it.
I would loosen the hood from the wall and see if it gives you enough wiggle room. Possibly a 2 pairs of hands job though.
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It's probably easier to unscrew the hood from the wall. They are not very heavy, and it's about 4 screws.
Airhead
bq
If it's anything like the Smeg cooker hood that I have just fitted, the chimney trim is a U shape and should clip sideways at the back of some metal fixings that are screwed into the wall, and will just sit on top of the main cooker hood part. If you can get in there, pull each side out sideways a little, and once released you should be able to pull it out towards you.