Flexible conduit thru vent duct ( Class 1 Div 2 location )

[Davebones]

Paint storage room 12' x 12' . They are installing a vent duct to the roof . The roof fan sits on the curb and has a Rating for class 1 div location . It has a sleeve down thru middle for electrical feed . Can flexible liquid type be ran into duct work and then up to fan on roof ?

 

[rbalex]

As I understand your description, installing the LFMC per Art 350 is not prohibited. Your major issue will be grounding/bonding per Sections 501.30 and 250.102.