Apprentice question
Stop and ask
Stop. Get direction before you touch it.
Do not hang a duct trapeze from a diagonal joist web member unless the structural detail specifically allows it. Move the load to an approved support point.
['Diagonal web members are part of the joist structure, not general hanger points. Side-loading one can bend the member and damage the joist.', 'Support the duct, remove the wrong attachment, and move to approved chord/panel-point support or an engineered bridging member.']