B738HT Would you like to tell me the exact difference between L&R RECIRC FAN, or which compartment the fans recircle?
Recirculated air is drawn from the space in the air conditioning distribution bay by the left recirculation fan, the air is drawn through filters and is discharged into the mix manifold. It mixes with air from the packs or external conditioned air for distribution into the passenger compartment.
Conditioned air in a collector shroud is recirculated by the Right recirculation fan.
The shroud collects air from the passenger compartment exhaust grilles in the carpet risers and the equipment cooling exhaust.