I am finishing a room (except ceiling which has been painted black), and I am installing a vent hood and the end of this duct work is about 2 inches too long. It looks like there is about 3' of extra ductwork that doesn't go anywhere, the last vent is in the picture:
So can this be cut and capped off like it is now? How would you cut it? I only need to cut maybe halfway down the first portion of before the support bracket.

So can this be cut and capped off like it is now? How would you cut it? I only need to cut maybe halfway down the first portion of before the support bracket.