Updated over 4 years ago on . Most recent reply
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Well.. you got yourself a big beam right there in the way of a straight shot for the HVAC duct. You can't cut that beam to run that size duct. I would guess you could hug the ducting up closer to the beam and have a shorter soffit... unless there is another open shot through the attic then you may be out of luck.
Also.. if your HVAC guys says he can do it then make sure you verify that he can do it without cutting any joists. Some HVAC guys will take a sawzall to a main joist without a second thought.