got it. thank you everyone for all the ideas. i put them all together.
i went with black PVC 4". i used a couple elbows to diminish light. i then stretched black pantyhose over the end and capped it with a cute little cap..........
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for the exhaust i used the box my new fan came in. i flipped it over the top of the hole and secured and sealed it with tape and staples. then i cut a door in the side. i covered that with pantyhose and made the door adjustable........
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it all works great.
