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Running the ballast outside the grow area will be your best move. It creates as much or more heat than the bulb.
Since your fixture is open-air, you need to direct the end of the ducting as close to the heat source as possible - in this case the bulb. Either route it around the front of the shelf if you can, or put a hole in the shelf and run it through so that it sucks horizontally from the bulb fixture. You can rig something up.
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