I think OP is saying there’s only an in-vent but no out-vent (or vice vera), so the hot air won’t actually flow anywhere. It’s like sucking through a straw with a big chunk of something stuck in the other end, very little water/air is actually gonna move through the system

EDIT

though on a closer look at the picture i see one addition is the card but another addition is a big extra fan, so forget what i said