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Nails. If they cannot be placed on top of a wall or beam a joist hanger is required as well.
if you can get under it you can put in a mid span beam or you have to beef up the size of the joist and make sure they are 16" on center
A joist, either floor or ceiling are the boards that go across the building and tie the walls together. A timber joist would be a rough sawn beam. Basically a tree that has been squared up.
In construction, a joist is a horizontal piece that runs from wall to wall, wall to beam or beam to beam. A joist is essentially considered to be one of the most supporting pieces towards the structural aspect. It focuses in on supporting beams and other pieces in the floor, ceiling and roof.
A joist is a beam, a supporting structure in a building. The roof joist was riddled with dry rot and had to be replaced.
Trimmer
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beam transfer loads from the joist to the wall or column where it supports..
"Rolled Steel joist", often referred to as an "I Beam" A metal beam used in constriction of buildings.
The duct work does not need to be different from the rest just because of the I beam. Just be sure there is room so you do not compress it.