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The FV11VHL2 should do fine.It is rated at 150cfms on high and 110 on low.As for the plate it will mount flush to a flat ceiling
Your bathroom is 7 and a half x 12 x average of 12 ceiling.So we would multiply 7.5x12x12=1080. Then divide that by 60(minutes in and hr)
1080 divided by 60=18.
Then multiply x8 (air changes per hour.
18 x 8 = 144cfms
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AS for the Whisper green ,do you have a model on it? WE need to be at the 144cfms if possible