how do these dual-chamber setups handle airflow routing internally?

been daily driving a twins pro for the past week just to test out the dual-flavor toggle. draw resistance is surprisingly decent for a pre-filled unit, but got me thinking about the internal engineering.

for anyone who’s ever taken one of these dual/multi-tank units apart: is it sharing a single airflow sensor with split sealed chimneys, or are there separate air paths completely to keep the flavor profiles isolated?

notice zero flavor bleed so far when switching toggles, which honestly surprised me given how cheap mass-produced hardware usually is.