grow tent ventilation help.

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i have this area in my room that is the only place i see i could let the hot air into if i cover the whole thing with wood and cut a hole so that the ducting goes to it. but in that there is 2 small holes that ducting doesnt fit into but if i seal the outside like i said the air has no way to go then down those holes. just wanted to make sure if that is safe and good for the ventilation. i also dont know where the wholes lead to just down the side of the house but inside the house so im guessing the air is flowing through to the next airway out to the next room most likely downstairs.
 
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