Soliciting ideas for improved ventilation:

With such a large salon, I'm finding it difficult to move a sufficient volume of outside air through the boat. I recently added temperature, humidity & air quality sensors (PM25 & VOC), and can clearly identify when VOCs -- presumably from the engine room -- are finding their way into the salon. I'm going to continue searching for explanations for the source of the VOCs, but once they're in the air, the only fix is running a large box fan from the after stateroom door, blowing toward the salon.

The round, active solar fan vents seem too small to make a dent, except perhaps to create slight positive pressure in the cabin (driving engine room smells "down" and out the engine room vents). Any other ideas?