Keep the duct runs as short as practical. (under 25 feet). The inner core of Flexible Insulated Ducting should be as tight and straight as possible and sealed to the grille housing/fan/wye connector/termination with aluminum foil tape. Ensure there is a minimum of 3 duct diameters between any fitting and the inlet/outlet of the fan. For the PB270-2 and PB370-2: It is better to have a short run of larger trunk line from the wye connector to the inlet of the fan and from the fan outlet to the termination point and longer runs of smaller duct from the grille/light to the wye connector.
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