What's the best tool to cut through this metal hot air ducting?

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I was able to remove most of the old hot air ducting in my hall without cutting it, as it was just push-fit to the other parts, but the last part, shown in the first photo, which passes through the airing cupboard to the bathroom (where the old vent has been plastered and tiled over) is firmly fixed in place, so I need to cut it away (once I've re-routed the electric cables of course, to ensure that I don't accidentally cut through them!) The second photo shows where the ducting runs through the airing cupboard, where it's encased in something which may contain asbestos, so I'm going to leave that bit alone for now.

The last two photos show the other end of this part in the hall, where some of the foam has been removed so you can see the metal underneath, and an end-on view of the main section that I've already removed, where you can see that the metal is quite thin.

What would be the best tool to cut this away at the point where it goes into the airing cupboard, after first removing the foam where I'm going to cut it? I guess I won't be able to cut it flush with the wall, or even the wooden surround, so I'll have to box in the cut end afterwards, which isn't ideal but it'll be better than having this ugly ducting running across the hall.

I'll have to climb a ladder to cut it (unless there's something with a long blade I can use standing on the floor, like a hedge trimmer for cutting metal), so I want to avoid using any power tools that are heavy or liable to dismember me if I can't move out of the way quickly.
 

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  • Venting going to to bathroom.jpg
    Venting going to to bathroom.jpg
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  • Encased venting to bathroom in airing cupboard.jpg
    Encased venting to bathroom in airing cupboard.jpg
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  • Cut foam under remaining venting.jpg
    Cut foam under remaining venting.jpg
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  • Main venting section 2.jpg
    Main venting section 2.jpg
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If it's fairly thin a nibbler - much better than snips. I cut 2m long steel roofing sheets with a hand-held one occasionally. Not that bad.
 
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