Hi,

I have a flower and veg room stacked on top of each other. They both have there own fans and carbon filters. I want to vent both out of one hole in the wall.

Do I just need to connect the two ends of the ducting via a tee piece and then connect the tee piece to the outside vent ?

Or will I need damper units/backdraft shutter to regulate the airflow ?

Thanks,

If you can get a Y-Piece that would cause less turbulence than a T-Piece and you'd get a better flow.

Cheers,
Felix.