Remember, Shane, that's where the bathroom fan vents anyway. Now, admittedly, the fumes from Flyboy's powered vent will be more, um, odorific, but I suspect that venting from the roof wouldn't make a significant difference. The particular gases being vented are likely to sink in the air so if they were vented from the roof they'd sink anyway. Hopefully by the time they'd get to anyone's party, they'd be diffuse enough that no one would notice.
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