I have to design a transition to flatten out some ductwork to go under
a support beam in my basement. This will bring this square section
down below the level of the drop ceiling. Where the drop section meets
the ductwork, can I just screw the angle bracket for the edge of the
drop ceiling right to the ductwork ?
Would you be afraid of the duct work getting cold and condensation
forming on the duct and on the angle bracket ?

Thanks